Chemistry

Atoms and Molecules


Trivalent Anions (Anions Having a Valency of 3-)


Trivalent anions means anions having a valency of 3-. In other words,trivalent anions means negative ions having a valency of 3- (three minus).Some of the important trivalent anions or trivalent negative ions are given below :
1.Nitride ion,N3- 3. Phosphate ion,PO43-
2.Phosphide ion,P3-
Please note that some of the metals like copper, mercury and iron form two types of ions having different charges or different valencies.For example :
(a) Copper metal (Cu) forms two types of ions,CU+ and CU2+.The Cu+ ion having 1 unit positive charge is known as copper (I) ion where (I) shows that the ion has a valency of 1+. The copper (I) ion CU+ is also known as cuprous ion. The second copper ion CU2+ having two units of positive charge is known as copper(II) ion where (II) means that the ion has a valency of 2+. The copper (II) ion CU2+ is also known as cupric ion.
(b) Mercury metal (Hg) also forms two types of ions,Hg+ and Hg2+.The Hg+ ion is known as mercury
(I) ion or mercurous ion and has a valency of 1+. On the other hand,Hg2+ ion is known as mercury (II) ion or mercuric ion and it has a valency of 2+.
(c) Iron metal (Fe) forms two types of ions,Fe2+ and Fe3+.The Fe2+ion is known as iron (II) ion or ferrous ion and it has a valency of 2+.The Fe3+ ion is known as iron (III) ion or ferric ion and it has a valency of 3+.

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Notes
Atoms and Molecules - Notes
1. Drawbacks of Dalton’s Atomic Theory
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2. Monovalent Cations (Cations Having a Valency of 1+)
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3. Divalent Cations (Cations Having a Valency of 2+)
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4. Trivalent Cations (Cations Having a Valency of 3+)
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5. Dalton’s Symbols of Elements
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6. an example, let us give the significance of symbol C
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7. Formulae of Some Molecular Compounds
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8. An Important Discussion
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9. Molecular Formulae of Some Common Elements
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10. Explanation of the Law of Conservation of Mass
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11. 2. A Negatively Charged Ion is Known as Anion
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12. Molecules
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13. As an example, let us give the significance of the formula H2O
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14. Simple Ions and Compound Ions (Polyatomic Ions)
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15. Molecules of Compounds
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16. Formulae of Elements
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17. Chemical Formulae
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18. Some Ionic Compounds
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19. Symbols of Elements
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20. Molecular Mass
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21. Gram Atomic Mass And Gram Molecular Mass
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22. Atoms
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23. Formulae of Compounds
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24. Formula Mass
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25. Atoms, Molecules and Ions
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26. 1. Molecules of Elements
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27. Mole of Atoms
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28. 1. A Positively Charged Ion is Known as Cation
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29. Ions
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30. Mole of Molecules
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31. Dalton's Atomic Theory
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32. Laws Of Chemical Combination
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33. Calculation of Molecular Mass
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34. Divalent Anions (Anions Having a Valency of 2-)
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35. Molecular Masses of Some Common Elements
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36. Some Common Ions
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37. Explanation of the Law of Constant Proportions
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38. John Dalton
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39. Significance of the Formula of a Substance
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40. Formula Unit of Ionic Compounds
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41. Ionic Compounds
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42. Symbols Derived from Latin Names of the Elements
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43. Modern Symbols of Elements
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44. Atomic Mass Of An Element
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45. Valencies of Some Common Metal Elements Valencies of Some Common Non-Metal Elements
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46. Atomic Masses of Some Common Elements
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47. Writing Of Formulae Of Molecular Compounds
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48. Laws Of Conservation of Mass
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49. Problems Based On Moles Of Atoms
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50. Writing Of Formulae Of Ionic Compounds
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