1.

How does the atomic radius change as we go : (i) from left to right across a period (ii) down a group in the periodic table ?

Answer»

Solution :On going :
(i) From LEFT to right across a period, atomic radius decreases as ONE proton and one electron are added continuously, therefore effective nuclear charge increases.
(ii) Down a group in the PERIODIC table, atomic radius increases because number of SHELLS goes on INCREASING, therefore distance between nucleus and valence shell increases.


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