Chemistry

Atoms and Molecules


Simple Ions and Compound Ions (Polyatomic Ions)


(i) Those ions which are formed from single atoms are called simple ions. For example, sodium ion,Na+,is a simple ion because it is formed from a single sodium atom, Na.Similarly, magnesium ion Mg2+,aluminium ion Al3+,oxide ion O2-, chloride ion Cl“, etc., are all simple ions. Simple ions are also known as monoatomic ions. (ii) Those ions which are formed from groups of joined atoms are called compound ions (or polyatomic ions). For example, ammonium ion NH+4, is a compound ion which is made up of two types of atoms joined together, nitrogen and hydrogen. Similarly, carbonate ion CO32-, sulphate ion SO42-, nitrate ion NO3- and hydroxide ion OH-,etc.,are all compound ions. Compound ions are also known as polyatomic ions.
Some of the common simple ions and compound ions (or polyatomic ions) and their symbols (or formulae) are given below.

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