State how atomic size varies from left to right in a period and from top to bottom in a group

Text Solution

Solution : (a) Atomic size goes on decreasing from left to right because one proton and one electron is being added successively therefore, force of attraction between valence electrons and nucleus increases therefore, atomic size decreases. <br> (b) The atomic size goes on increasing from top to bottom in a group because number of .shells keep on increasing .therefore, distance between nucleus and valence electrons increases.

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