Question

How does size of atomic radius vary on moving left to right in a horizontal column in periodic table 0?

Answer 1

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Therefore, moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases. Moving down a group in the periodic table, the number of filled electron shells increases. ... Anions have a greater radius than theatom that they were formed from.

Answer 2

Atomic radius decreases on moving left to right as the number of shells remain same but more and more electrons are added with results into increase in nuclear charge i.e. force of attraction between nucleus and electron(nucleus has + charge and electrons have - charge) so the the atom shrinks and atomic radius decreases.