Chemistry

Structure of the Atom


(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,Mg2+ 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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Notes


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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4. Structure of The Atom - Study Points
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5. 4.Isotopes of Neon.
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6. Radioactive Isotopes
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7. 3.Isotopes of Oxygen.
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8. Nucleus
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9. Arrangement Of Electrons In The Atoms
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10. Characteristics of a Neutron
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11. (d) Covalency of Nitrogen
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12. Characteristics of an Electron
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13. Limitations of Rutherford's model of the atom
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14. (b) Valency of Magnesium
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15. How to learn naming Chemical Formulae?
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16. All about Names of the Chemical Elements
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17. 1. Isotopes of Hydrogen.
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18. Mass Number
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19. (d) Valency of Chlorine
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20. Characteristics of a Proton
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21. Comparison between Proton, Neutron and Electron
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22. Electronic Configurations of First 20 Elements
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23. Discovery of Neutron
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24. Thomson's Model Of The Atom
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25. Isotopes
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26. (e) Valency of Oxygen
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27. Rules for writing of distribution of electrons in various shells for the first 18 elements
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28. Covalency of Oxygen
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29. 2.Covalency
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30. (a) Covalency of Hydrogen
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31. Bohr's Model Of The Atom
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32. Discovery Of Electron
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33. (a) Valency of Sodium
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34. Rutherford's Model Of The Atom
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35. 2.Isotopes of Carbon.
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36. Atomic Number
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37. The Physical Properties of the Isotopes of an Element are Different
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38. Charged Particles in Matter
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39. Discovery of Proton
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40. All the Isotopes of an Element Have Identical Chemical Properties
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41. Valaency Of Elements
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42. Relationship Between Mass Number and Atomic Number
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43. (f) Valency of Nitrogen
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44. Electronic Configurations of Noble Gases (or Inert Gases)
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45. Valaence Electrons (Or Valancy Electrons)
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46. Covalency of Chlorine
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47. Cause of Chemical Combination
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48. Reason for the Fractional Atomic Masses of Elements
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49. Relation Between Valency and Valence Electrons
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50. (c) Valency of Aluminium
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