Atomic Radii of Some Common Elements
Element Atomic radius (Radius of atom) | Element Atomic radius (Radius of atom) |
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1.Hydrogen 0.037 nm 2.Carbon 0.077 nm 3.Nitrogen 0.074 nm 4.Oxygen 0.073 nm 5.Chlorine 0.099 nm 6.Sulphur 0.104 nm | 7.Sodium 0.191 nm 8.Magnesium 0.160 nm 9.Calcium 0.197 nm 10.Iron 0.126 nm 11.Copper 0.128 nm 12.Gold 0.144 nm |
Atoms are so small that we cannot see them even under the most powerful optical microscope. Electron microscope (which uses electrons for its working) can produce extremely magnified images of tiny objects.The most advanced type of electron microscope is the Scanning Tunnelling Microscope (STM). Scanning tunnelling microscope can produce computer-generated images (pictures) of the surface of elements which show the individual atoms.The atoms show up as blurred spheres (see Figure 12).Thus,the scanning tunnelling microscope enables us to see atoms,though indirectly.
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Atoms and Molecules - Notes
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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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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9. Explanation of the Law of Conservation of Mass
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10. Molecular Formulae of Some Common Elements
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11. 2. A Negatively Charged Ion is Known as Anion
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13. As an example, let us give the significance of the formula H
2O
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14. Simple Ions and Compound Ions (Polyatomic Ions)
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21. Gram Atomic Mass And Gram Molecular Mass
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28. 1. A Positively Charged Ion is Known as Cation
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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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37. Explanation of the Law of Constant Proportions
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39. Significance of the Formula of a Substance
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42. Symbols Derived from Latin Names of the Elements
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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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50. Writing Of Formulae Of Ionic Compounds
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