There is a small increase in atomic radius in moving from P to As in group 15 elements as compared to large increase in atomic radius in moving from N

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There is a small increase in atomic radius in moving from P to As in group 15 elements as compared to large increase in atomic radius in moving from N to P in the same group. Explain.


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Salim Ahmed Kawsar

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The atomic radii of the three elements are : N (70 pm), P(110 pm) and As (121 pm). In moving from N to P, there is effective shielding by intervening s and p-electrons while it is comparatively poor by intervening d-electrons which are involved in moving from P to As. As a result, the increse in atomic radius is less in this case.

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