8.3.5 Analysis and diagnostic kits. Common Anions Table and Formulas List FeS 15. A polyatomic ion contains more than one element. iii) The anion, sulfide, is: S 2-(the –ide suffix indicates that it is a simple anion). We would like to show you a description here but the site won’t allow us. For example, consider binary ionic compounds of iron and chlorine. II Number Number Total + Total - Combining Ions Formula Name of compound of cations of anions charge charge 1. Magnesium iodide 19. ... Iron(II) chloride or ferrous chloride The cation charge must be specified since iron can form more than one charge. 1. A cation is a positively charged ion with fewer electrons than protons while an anion is a negatively charged ion with more electrons than protons. Hence FeS is iron(II) sulfide, while Fe 2 S 3 is iron(III) sulfide. In chemistry, iron(II) refers to the element iron in its +2 oxidation state.In ionic compounds (salts), such an atom may occur as a separate cation (positive ion) denoted by Fe 2+.. Potassium & Sulfate 2- Kz 504 fotassim Sulfate 24 5. FeS has iron in its +2 oxidation state. 11. In chemistry, a salt is defined as an ionic compound formed when a positively charged ion is bonded to a negatively charged ion. What’s in a Name? For example, iron(III) iodide, FeI 3, is composed of iron ions, Fe 3+ (elemental iron is a metal), and iodide ions, I-(elemental iodine is a nonmetal). Formulas of Ionic Compounds Fe2+ = iron(II) 3. iron II nitride iron III sulfate and sodium sulfide are mixed, what Cobalt (II) nitrate 22. H #1s^1# He #1s^2# Li #1s^2 2s^1# Be #1s^2 2s^2# B #1s^2 2s^2 2p^1# C #1s^2 2s^2 2p^2# N #1s^2 2s^2 2p^3# O #1s^2 2s^2 2p^4# F #1s^2 2s^2 2p^5# The positive ion (cation) is written first in the name; the negative ion (anion) is written second in the name. Choose the correct answer: a) cations have a positive charge, anions have a negative charge b) anions have a positive charge, cations have a negative charge c) the opposite of a cat ion is a dog ion d) uh, what? Yonca Avci Duman, in Three Phase Partitioning, 2021. Group I (Ag+, Pb2+, Hg2+) cations produce insoluble chlorides so they can be precipitated with dilute HCl, while all other cations remain in solution. Precipitation reactions We c ion" respectively (See "Table of Transition Metal Ions" call these ions "iron (II) ion" and "iron (II When naming any ion from the elements listed above, you MUST include a Roman numeral in parentheses following the name of the ion The this roman numeral is equal to the charge on For example, FeCl 2,which would have been named iron(2)-chloride according to Stock's original idea, became iron(II) chloride in the revised proposal. Anions 1- acetate C 2H 3O 2-cyanide CN- amide NH 2-cyanate OCN-hydrogen carbonate fluoride F- ... sulfide S2-sulfite SO 3 2-tartrate C 4H 4O 6 2-tetraborate B 4O 7 2-thiosulfate S 2O 3 2-3- arsenate AsO 4 3-arsenite AsO 3 3- They have an opposite electrical charge, therefore they get attracted to each other. For example, iron forms two ions Fe2+ and Fe3+. The charge of the metal ion is determined from the formula of the compound and the charge of the anion. Cation Anion Name Formula NH 4 + S2– Fe3+ iron(III) carbonate NO 3 – AgNO 3 potassium cyanide KCN cation lead(II) sulfide aluminum selenide anion The name includes a Roman numeral representing the ionic charge of the transition metal cation. Examples. Adjust the subscripts of the cation and anion so the net charge is 0. .../Ferrous sulfide/ is occasionally formed unintentionally when materials containing sulfur are treated in iron and steel vessels- eg in petroleum refineries. Iron (II) & Sulfide 2- Fes 1 1 r on and Sulfide 4. Answer (1 of 2): In this case two reactions are happening; first a redox between iron(III) and sulfide, then a precipitation of iron(II)sulfide. Magnesium sulfate 28. Silver (I) sulfide 29. Fe ion + 2 Cl-= Fe ion + 2- = 0 Fe ion = 2+ 2. Like a cation, the charge carried by an anion is related to the ground-state electron ... To name an ionic compound, one should name the cation first, and then name the anion (with the word ‘ion’ omitted). It is made of iron and sulfide ions. MnBr 2 13. Yonca Avci Duman, in Three Phase Partitioning, 2021. Copper II sulfate (CuSO4) is an ionic compound; a combination of a cation (positive ion) and an anion (negative ion). Sulfide, Oxide, Fluoride, Chloride. Common Covalent Binary Inorganic Compounds # of atoms Prefix (element closest to fluorine goes on right)Common Examples 1 Mono H 2 Hydrogen N 2 Nitrogen 2 Di O 2 Oxygen NH 3 Ammonia 3 Tri O 3 Ozone NO Nitrogen monoxide (Nitric Oxide) 4 Tetra H 2O Water (Dihydrogen Monoxide) NO 2 Nitrogen dioxide 5 Penta F 2 Fluorine N 2O Dinitrogen monoxide (Nitrous oxide) 6 Hexa HF Hydrogen fluoride N Once the number of units of the cation and anion is determined those … In 1934, Stock approved of the Roman numerals, but felt it better to keep the hyphen and drop the parenthesis. Cation repels other cation whereas anion repels another anion. A cation is a positively charged ion; An anion is a negatively charged ion. For example, consider binary ionic compounds of iron and chlorine. FORMULAS AND NOMENCLATURE OF IONIC AND COVALENT COMPOUNDS Adapted from McMurry/Fay, section 2.10, p. 56 -63 and the 1411 Lab Manual, p. 27 -31. Iron(III) sulfide, also known as ferric sulfide or sesquisulfide, is one of the three iron sulfides besides FeS and FeS 2. By controlling the sulfide ion concentration at a low enough level, we can first precipitate then just the group II ions. There are certainly bromide Br-chloride Cl-fluoride F-iodide I-nitride N 3-oxide O 2-sulfide S 2- Write the net ionic equation. It reacts with acids such as hydrochloric acid to make hydrogen sulfide gas.. Also to know is, is iron sulfide a solid? Sodium & Oxide 2Na z O 2 + Sodium ox.de 3. ... sulfide . Classify each of the following ions as a monoatomic cation, monoatomic anion, polyatomic cation, or polyatomic anion: (a) barium ion, Ba. Write the complete ionic equation for the reaction. Step #3 - Sulfide (the anion) means S 2 ¯. If there's just a minus sign, it means the charge is minus 1. Review several examples of anions. Compound Water Soluble Cation Anion (a) Na2CO3 yes 2 Na+ CO32- (b) CuSO4 yes Cu2+ SO42- ... iron(II) nitric iron(II) water carbon ... S + 2 HBr H 2 S + 2 NH 4 Br Ammonium sulfide Hydrogen bromide Hydrogen sulfide Ammonium bromide Oxidation Numbers 41. Overall, this study demonstrates that in-situ generation of iron and alkalinity is an effective alternative method for hydrogen sulfide control in sewers. The solid that separates is called a precipitate. What is the ions make up iron II oxide? The solid that separates is called a precipitate. Determine the charge of the cation using the charge of the anion (Cl-). It is not necessary to indicate the number of cations and Hgl 17. TYPES OF COMPOUNDS Ionic compounds are compounds composed of ions, charged particles that form … Name the cation by the element name and add a Roman numeral in parenthesis to show its charge. Identify the spectator ions, and cancel them on both sides of the equation. a compound made of 1 calcium cation, 1 chloride anion and 1 iodide anion is not a valid compound for this game). These are molecules that have two or more atoms with ionic groups. FeCl 2 = iron(II) chloride Cesium fluoride 18. Polyatomic Ions Worksheet Polyatomic Practice 1. Rule 1. AgCl Opposite electric charges are pulled towards one another by electrostatic force , so cations and anions attract each other and readily form ionic compounds . Peroxidases are part of versatile diagnostic kits based on enzyme-conjugated antibody technology, because of their capability to produce stable chromogenic products (Krell, 1991).An example is the use of turnip root peroxidase in kits for detection of uric acid (Agostini et al., 2002). H #1s^1# He #1s^2# Li #1s^2 2s^1# Be #1s^2 2s^2# B #1s^2 2s^2 2p^1# C #1s^2 2s^2 2p^2# N #1s^2 2s^2 2p^3# O #1s^2 2s^2 2p^4# F #1s^2 2s^2 … There’s no good trick to remembering these, you just need to memorize them. Non metals gain … Cation Anion Name Formula NH 4 + S2– Fe3+ iron(III) carbonate NO 3 – AgNO 3 potassium cyanide KCN cation lead(II) sulfide aluminum selenide anion The name includes a Roman numeral representing the ionic charge of the transition metal cation. KEY What are the charges on the copper and phosphide ions, respectively, in … It has iron in its +2 oxidation state. Iron typically exhibits a charge of either 2+ or 3+ (see ), and the two corresponding compound formulas are FeCl 2 and FeCl 3. Iron typically exhibits a charge of either 2+ or 3+ (see ), and the two corresponding compound formulas are FeCl 2 and FeCl 3. Write the anion with an ide ending. Group III Cation Page 101 I - Iron (L. Ferrum), Fe Iron forms two important series of salts : the ferrous salts which may be regarded as derived from ferrous oxide FeO in which the metal is divalent, and the ferric salts, which may be regarded as derived from ferric oxide Fe 2 O 3 in which the metal is trivalent. Anions and cations are both ions. Keep in mind, hydrogen can go either way, carrying either a positive or negative charge. A monatomic (meaning one-atom) cation takes its name from the name of the element. Cesium fluoride 18. The mass m m of a sample can be converted to a quantity of moles n n by dividing by the molecule's molar mass M W M W , which for iron (II) sulfate … If the plant is opened and the deposit of ferrous sulfide is exposed to air, its exothermic oxidation may raise temp of … Sometimes the cation or anion is a polyatomic ion. Magnesium iodide 19. Chromium (II) acetate 23. Silver (I) sulfide 29. Write sodium sulfide, iron(II) sulfate, and sodium sulfate as ions. For purifying an iron(II) salt solution contaminated with nickel ions and lead ions, the hyperstoichiometric addition of sodium sulfide or sodium hydrogen sulfide in the acid range has proved itself as suitable when a residence time in the order of one hour is adhered to before the sulfides are removed by filtration. chemical reaction - chemical reaction - Precipitation reactions: Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The most common positive one is ammonium, NH4+ Types of Anions (negative ions): A. Crbr4 anion and cation Arkansas State University Department of Chemistry and Physics Cation/ Anion List Worksheet for naming ions Students enrolled in Dr. Draganjac's Introduction to Chemistry (CHEM1003), General Chemistry I (CHEM1013) and General Chemistry II (CHEM1023) classes are responsible for learning the names and formulae for the common acids and Potassium sulfide 25. What is the Latin system name for Fe2O3? In naming ionic compounds whose cations can have more than one possible charge, we must also include the charge, in parentheses and in roman numerals, as part of the name. Anion exchange resin, OH- from, to remove anions, e.g. Symbols and Charges for Monoatomic Ions Fixed Charge Symbol Name Symbol Name H+ hydrogen ion H-hydride Li+ lithium ion F-fluoride Na+ sodium ion Cl-chloride K+ potassium ion Br-bromide Rb+ rubidium ion I-iodide Cs+ cesium ion O2-oxide Be2+ beryllium ion S2-sulfide Mg2+ magnesium ion Se2-selenide Ca2+ calcium ion Te2-telluride Sr2+ strontium ion N3-nitride Aluminum & Chloride Aicl 3 3 3- Alumtum chloride 2. If there's just a minus sign, it means the charge is minus 1. Review several examples of anions. Sulfur anion-hydrated cation (S 2−-K + (H 2 O) n) networks between the surface adsorbed S 2− and K + in the KOH electrolyte boost the production of active H* from water electrolysis. PbO 14. Write the anion with an ide ending. The electron configuration for the first 10 elements. If there is more than one monatomic cation of an element→ Rule 1 is not sufficient →Use Stock system Example: Fe2+ is called iron(II) ion and Fe3+ is called iron(III) ion. Sodium hypobromite 21. In chemistry, a salt is defined as an ionic compound formed when a positively charged ion is bonded to a negatively charged ion. Fe2+ Iron (II) Fe3 + Iron (III) Cu+ Copper (I) Cu2+ Copper (II) Sn4+ Tin(IV) Sn2+ Tin(II) B. iron, silver, nickel), whilst most other nonmetals typically form anions (e.g. Rule 2. Iron Nitrate is a highly water soluble crystalline Iron source for uses compatible with nitrates and lower (acidic) pH. Cations and anions are positively and negatively charged atoms, respectively. If m or n is 1, then no subscript is written in the formula. TYPES OF COMPOUNDS Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms) gains or loses electrons. Iron, Lead, Sodium. 1. Writing Formulas of Ionic Compounds. Iron (III) carbonate 20. For example, iron(II) has a 2+ charge; iron(III) a 3+ charge. Lead (II) nitrate … Step #4 - since a formula must have zero total charge, you write the formula Fe 2 S 3. These are molecules that have two or more atoms with ionic groups. Name or write the formula for the following polyatomic ions sulfate CO3 2-nitrite MnO3 1-perphosphate SO5 2-hypoiodite BrO2 1-chlorite CO4 2-phosphite PO5 3-percarbonate ClO1-bromate IO2 1-hyposulfite PO4 3-permanganate NO2 1-carbonite SO4 2-2. It is found in the ground as the mineral pyrite. Identify the spectator ions for the reaction that occurs when aqueous solutions of lsodium sulfide and iron(II) nitrate are mixed. Calcium carbonate 26. Toggle navigation. Halogens always form anions, alkali metals and alkaline earth metals always form cations. Calcium carbonate 26. 1. mercury (II) sulfide 2. zinc oxide 3. sodium sulfide 4. copper (I)oxide 5. iron(111) bromide 6. tin (IV) oxide 7. aluminum oxide 8. manganese (I) sulfide 9. cobalt(II)phosphide 10. silver iodide _ Give the correct name for each of the following ionic compounds. Cr 2 0 3 12. The electron configuration for the first 10 elements. (1) 2 Fe^3+(aq) + S^2-(aq) → 2 Fe^2+(aq) + S(s) (2) Fe^2+(aq) + S^2-(aq) → FeS(s) After combining these two reactions we … Each sulfide ion has a 2- charge, so if there are three sulfide ions, the two iron cations must have a total charge of 6+ or 3+ on each cation. bromide Br-chloride Cl-fluoride F-iodide I-nitride N 3-oxide O 2-sulfide S 2- Write the cation first, followed by the anion. In 1934, Stock approved of the Roman numerals, but felt it better to keep the hyphen and drop the parenthesis. Find the symbol of the cation and the anion; Find the charge of each symbol and place it in parenthesis above the symbol; Balance out the total positive and negative charge on the cation and anion. FORMULAS AND NOMENCLATURE OF IONIC AND COVALENT COMPOUNDS Adapted from McMurry/Fay, section 2.10, p. 56 -63 and the 1411 Lab Manual, p. 27 -31. The negative charge (fewer protons than electrons) for an anion is shown by a number and minus sign after the formula. Cobalt (II) nitrate 22. Because of this, they are attracted to one another. (#)H 2 O. where the H 2 O is omitted if the # is zero, m is the oxidation state of the anion, and n is the oxidation state of the anion. What is iron sulfide an example of? For example, Cu + is called Copper(I) and Cu 2+ is called Copper(II) in the names of compounds containing these ions. (sodium chloride = 1 sodium cation + 1 chloride anion). For questions on oxidation number, read the symbol (x) as “the oxidation number of x.” For questions on oxidation number, read the symbol (x) as “the oxidation number of x.” Copper (I) oxide 31. It is made of iron and sulfide ions. The words anion and cation are derived from the Greek words ano, meaning up, and kata, meaning down, respectively. 2+ ... Write the chemical formula for the following binary compounds given their constituent ions: (a) iron(II) sulfide, Fe. CuO 18. asked Jul 11, 2019 in Chemistry by Logic. When an anion and a cation are drawn together due to this electrostatic attraction, they can form an ionic bond. For cards containing multiple dots or holes, the corresponding ion(s) must be the same (i.e. For cards containing multiple dots or holes, the corresponding ion(s) must be the same (i.e. We would like to show you a description here but the site won’t allow us. Write formulas for the oxide, sulfide, and chloride compound of each iron cation, and give the name of each compound in both the nomenclature method that uses Roman numerals to specify the charge of the cation and the $-ous/-ic$ notation. Cations are atom or molecule that has more protons than electrons, making it a positively charged ion. Na+ and Fe2+ C. Na+ and NO3-D. S2- and Fe2+ E. No spectator ions are present. It can be prepared synthetically by heating iron(II) oxalate (FeC 2 O 4), although the product of this reaction is contaminated with another oxide of iron, triiron tetroxide (Fe 3 O 4). Iron (III) carbonate 20. A monatomic (meaning one-atom) cation takes its name from the name of the element. For example, Cu + is called Copper(I) and Cu 2+ is called Copper(II) in … In chemistry, iron(II) refers to the element iron in its +2 oxidation state.In ionic compounds (salts), such an atom may occur as a separate cation (positive ion) denoted by Fe 2+.. b) ammonium sulfide, NH 4 S c) Magnesium hydroxide, Mg(OH) 2 d) zinc carbonate, ZnCO 3. It reacts with acids such as hydrochloric acid to make hydrogen sulfide gas. 18. oxygen, carbon, sulfur).Aug 15, 2019. -Older system of nomenclature, such ions are named by adding the suffixes -ous and -ic to a stem name of the element to indicate the ions of lower and higher charge, respectively. It is not necessary to indicate the number of cations and Based on the formula, there are two iron cations and three sulfide ions. Name the cation by the element name and add a Roman numeral in parenthesis to show its charge. Hydrogen sulfide induced corrosion of concrete sewer pipes is a major issue for wastewater utilities globally. In this compound, the cation is only the copper II, Cu+2. Most other metals form cations (e.g. Sulfur anion-hydrated cation (S 2−-K + (H 2 O) n) networks between the surface adsorbed S 2− and K + in the KOH electrolyte boost the production of active H* from water electrolysis. ii) The cation, aluminum ion, is: Al 3+ (if you forget the charge of the aluminum ion, look up the position of Al in the periodic chart). There are only 3 cation polyatomic ions and they are ammonium (NH 4 +), hydronium (H 3 +), and mercury(I) (Hg 2 2+). 17. Find the symbol of the cation and the anion; Find the charge of each symbol and place it in parenthesis above the symbol; Balance out the total positive and negative charge on the cation and anion. The sulfide concentration can be adjusted pH changing the pH, because hydrogen sulfide is an acid, … The cation of a transition metal is always named first (like any cation) and the anion second. The charge of the metal ion is determined from the formula of the compound and the charge of the anion. As with all ionic compounds, the cation is named first, then the anion: Examples: (NH4)2S ammonium sulfide K3PO4 potassium phosphate Zn(NO3)2 zinc nitrate Fe2(SO4)3 iron(III) sulfate (or ferric sulfate) CuCO3 copper(II) carbonate (or cupric carbonate) Note: In a formula, parentheses ( ) are used around a polyatomic ion only when there are 2 There are only 3 cation polyatomic ions and they are ammonium (NH 4 +), hydronium (H 3 +), and mercury(I) (Hg 2 2+). Examples: Fe2+ (ferrous ion) and Fe3+ (ferric ion) Cu+ (cuprous ion) and Cu2+ (cupric ion) Nitrate compounds are generally soluble in water. Problem 51 Hard Difficulty. The name of Fe2O3 is iron(III) oxide according to the Stock system. Iron (II) oxide or FeO is an ionic compound made up of one Fe+2 cation and one O-2 anion. Magnesium sulfate 28. ... sulfide . This kind of bond is the result of opposing charges attracting one another, and is distinct from other types of bonding. What Type Of Elements Form Cations? Did You Know? Fe ion + 2 Cl-= Fe ion + 2- = 0 Fe ion = 2+ 2. Compounds having anions such as sulfide … Anions include halogens and nonmetals. Example #3 - Write the formula for: iron(III) sulfide. Nickel (II) perchlorate 27. Like a cation, the charge carried by an anion is related to the ground-state electron ... To name an ionic compound, one should name the cation first, and then name the anion (with the word ‘ion’ omitted). Leave iron(II) sulfide as a formula unit since this ionic compound has low solubility. FeCl 2 = iron(II) chloride Peroxidases are part of versatile diagnostic kits based on enzyme-conjugated antibody technology, because of their capability to produce stable chromogenic products (Krell, 1991).An example is the use of turnip root peroxidase in kits for detection of uric acid (Agostini et al., … All metallic nitrates are inorganic salts of a given metal cation and the nitrate anion. Iron Fe2+ Iron(II) ion Ferrous ion Fe3+ Iron(III) ion Ferric ion ... sulfide. 17. … Iron Fe2+ Iron(II) ion Ferrous ion Fe3+ Iron(III) ion Ferric ion ... sulfide. Step #1 - the symbol of the cation is Fe. Pentafluorophenylboron-capped iron and cobalt(II) hexachloroclathrochelate precursors were obtained by the one-pot template condensation of dichloroglyoxime with pentafluorophenylboronic acid on iron and cobalt(II) ions under vigorous reaction conditions in trifluoroacetic acid media. Example: Fe2+ is called iron(II) ion and Fe3+ is called iron(III) ion. 2+ chemical reaction - chemical reaction - Precipitation reactions: Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). Iron sulfide is the chemical compound FeS, a black solid. FeF 2 16. These cations are very insoluble, and they are considered more soluble than the group II cations. A. Fe2+ and NO3-B. A polyatomic ion contains more than one element. The functions of the exopolymers seem to be: (i) to mediate attachment to a (metal) sulfide surface, and (ii) to concentrate iron(III) ions by complexation through uronic acids or other residues at the mineral surface, thus, allowing an oxidative attack on the sulfide. ScienceStruck elaborates on the differences between the two, through a cation vs. anion comparison. Determine the charge of the cation using the charge of the anion (Cl-). Common Covalent Binary Inorganic Compounds # of atoms Prefix (element closest to fluorine goes on right)Common Examples 1 Mono H 2 Hydrogen N 2 Nitrogen 2 Di O 2 Oxygen NH 3 Ammonia 3 Tri O 3 Ozone NO Nitrogen monoxide (Nitric Oxide) 4 Tetra H 2O Water (Dihydrogen Monoxide) NO 2 Nitrogen dioxide 5 Penta F 2 Fluorine N 2O Dinitrogen monoxide (Nitrous … Lead (II) nitrate 30. The prolonged anodic dissolution of iron resulted in the formation of a partly crystalline sulfide layer on its surface, … Iron forms both $2+$ and $3+$ cations. Cl-, from solution RZ-N(CH 3) 3 + OH-+ Cl--->RZ-N(CH 3) 3 + Cl-+ OH-To "soften" water, usually only a cation exchange resin is used. Group III ions include Nickel, chromium, iron and bismuth. There are certainly From a list of almost 2000 names and formulas, students will be given the opportunity to practice their ability to name ionic compounds, given the formula, and … As with all ionic compounds, the cation is named first, then the anion: Examples: (NH4)2S ammonium sulfide K3PO4 potassium phosphate Zn(NO3)2 zinc nitrate Fe2(SO4)3 iron(III) sulfate (or ferric sulfate) CuCO3 copper(II) carbonate (or cupric carbonate) Note: In a formula, parentheses ( ) are used around a polyatomic ion only when there are 2 ... Iron(II) chloride or ferrous chloride The cation charge must be specified since iron can form more than one charge. One of the most commonly used methods to combat hydrogen sulfide is the addition of ferric chloride. If both a cation exchange resin and an anion exchange resin are used with tap water to remove ionic salts by ion exchange, the resulting (sodium chloride = 1 sodium cation + 1 chloride anion). Electron Configurations are an organized means of documenting the placement of electrons based upon the energy levels and orbitals groupings of the periodic table.. Compound Water Soluble Cation Anion (a) Na2CO3 yes 2 Na+ CO32- (b) CuSO4 yes Cu2+ SO42- ... iron(II) nitric iron(II) water carbon ... S + 2 HBr H 2 S + 2 NH 4 Br Ammonium sulfide Hydrogen bromide Hydrogen sulfide Ammonium bromide Oxidation Numbers 41. Anions and cations have opposing charges. Group II (Cu2+, Bi3+, Cd2+, Hg2+, As3+, Sb3+, Sn4+) cations produce very insoluble sulfides (Ksp values less than 10-30) so they can be precipitated by low amounts of sulfide ion; this can be A cation is a positively charged ion; An anion is a negatively charged ion. Sometimes the cation or anion is a polyatomic ion. A polyatomic ion-- Consists of more than one atom. (3, 4) Anions are atom/molecules that have more electrons than protons, hence, they are negatively charged ions. Examples. 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