(b) Valency of Magnesium
The atomic number of magnesium is 12, and its electronic configuration is 2,8,2. It has 2 electrons in its valence shell. The magnesium atom can lose these two outermost electrons to form a magnesium ion, having an inert gas electron configuration of 2, 8.Since one magnesium atom loses 2 electrons to achieve the inert gas electron configuration, therefore, the valency of magnesium is 2 (or 2+).The atomic number of calcium is 20 and its valency is also 2. Similarly, the atomic number of beryllium (Be) is 4 and its valency is also 2. 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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3. For the symbols H, D and T,tabulate three sub-atomic particles found in each of them.
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5. Structure of The Atom - Study Points
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10. Arrangement Of Electrons In The Atoms
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13. Limitations of Rutherford's model of the atom
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15. All about Names of the Chemical Elements
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17. How to learn naming Chemical Formulae?
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20. Comparison between Proton, Neutron and Electron
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21. Electronic Configurations of First 20 Elements
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27. Rules for writing of distribution of electrons in various shells for the first 18 elements
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35. 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. Valaence Electrons (Or Valancy Electrons)
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47. Electronic Configurations of Noble Gases (or Inert Gases)
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48. Reason for the Fractional Atomic Masses of Elements
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50. Applications of Radioactive Isotopes
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