(d) Valency of Chlorine
The atomic number of chlorine is 17, so its electronic configuration is 2, 8, 7. The chlorine atom has 7 electrons in its outermost shell and it needs 1 more electron to achieve the 8-electron configuration. So, the chlorine atom gains (accepts) 1 electron to form a chloride ion, ,having an inert gas electron arrangement of 2,8,8.Since one chlorine atom gains 1 electron to achieve the inert gas electron configuration,so the electrovalency of chlorine is 1 (or 1-).Fluorine has atomic number 9, and its electrovalency is also 1 (or 1-). Explain it yourself. The other halogens bromine and iodine also have 7 valence electrons each and need 1 electron each to achieve the inert gas electron arrangements. So, bromine and iodine also have the valency of 1 (or 1-).
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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. Arrangement Of Electrons In The Atoms
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10. Structure of The Atom - Study Points
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11. Limitations of Rutherford's model of the atom
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13. All about Names of the Chemical Elements
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16. How to learn naming Chemical Formulae?
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23. Comparison between Proton, Neutron and Electron
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24. Rules for writing of distribution of electrons in various shells for the first 18 elements
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25. Electronic Configurations of First 20 Elements
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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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48. Applications of Radioactive Isotopes
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50. Electronic Configurations of Elements
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