Q-13. Write drawback of Thomson model of atom.
Q-14. If any element X has 12 neutron and 12 proton calculate its atomic mass and atomic number
Q-15. Write the valency of Mg and O.
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13) Thomson's atomic model failed to explain how the positive charge holds on the electrons inside the atom. It also failed to explain an atom's stability. The theory did not mention anything about the nucleus of an atom. It was unable to explain the scattering experiment of Rutherford.
14) If any element X has 12 neutron and 12 proton calculate its atomic mass and atomic number will be 24.
15) The valency of magnesium is 2. Magnesium has an atomic number of 12, and it belongs to the second group in the periodic table.
The valency of oxygen is 2, because it needs two atoms of hydrogen to form water.
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