(a) Valency of Sodium
The atomic number of sodium is 11, so its electronic configuration is 2, 8, 1.It has 1 electron in its outermost shell. Sodium atom can lose this electron to form a sodium ion, Na*, having an inert gas electron arrangement of 2, 8.Since a sodium atom loses 1 electron to achieve the inert gas electron configuration,therefore, the valency of sodium is 1 (or 1+).The atomic number of potassium is 19 and its valency is also 1. Similarly, the atomic number of lithium is 3 and its valency is also 1. Explain these two cases yourself.
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Structure of the Atom - Notes
1. Drawback of Rutherford’s Model of the Atom
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2. Rutherford’s Experiment - Discovery of Nucleus
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4. For the symbols H, D and T,tabulate three sub-atomic particles found in each of them.
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9. Structure of The Atom - Study Points
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10. Limitations of Rutherford's model of the atom
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11. Arrangement Of Electrons In The Atoms
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12. All about Names of the Chemical Elements
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17. How to learn naming Chemical Formulae?
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22. Rules for writing of distribution of electrons in various shells for the first 18 elements
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24. Electronic Configurations of First 20 Elements
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25. Comparison between Proton, Neutron and Electron
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33. The Physical Properties of the Isotopes of an Element are Different
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39. All the Isotopes of an Element Have Identical Chemical Properties
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42. Relationship Between Mass Number and Atomic Number
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44. Electronic Configurations of Noble Gases (or Inert Gases)
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50. Applications of Radioactive Isotopes
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