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 ?
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 ?
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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 the number of shells goes on increasing, therefore, the distance between nucleus and valence shell increases
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