(c) Valency of Aluminium
The atomic number of aluminium is 13, so its electronic configuration is 2, 8, 3. It has 3 electrons in its outermost shell. The aluminium atom can lose these 3 electrons to form the aluminium ion, ,having an inert gas electron configuration of 2,8. Since one atom of aluminium loses 3 electrons to achieve the inert gas electron configuration, so the valency of aluminium is 3 (or 3+).The atomic number of boron (B) is 5 and its valency is also 3. Explain it 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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5. 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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11. Limitations of Rutherford's model of the atom
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12. All about Names of the Chemical Elements
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13. Structure of The Atom - Study Points
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15. How to learn naming Chemical Formulae?
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25. Rules for writing of distribution of electrons in various shells for the first 18 elements
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28. Electronic Configurations of First 20 Elements
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29. Comparison between Proton, Neutron and Electron
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32. 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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47. Applications of Radioactive Isotopes
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48. Electronic Configurations of Elements
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50. Reason for the Fractional Atomic Masses of Elements
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