Describe the trend you expect to see between the atomic radii of Al, Cr, Mo and...

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Describe the trend you expect to see between the atomic radii of Al, Cr, Mo and...

Describe the trend you expect to see between the atomic radii of Al, Cr, Mo and W do your calculation corroborate this? explain your answer

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Answer 1

Answer #1

Atomic Radius Electronic Configuration

Al 143 pm [Ne]3s²3p¹

Cr 128 pm [Ar] 4s¹3d⁵ ( poor shielding effect of d-orbital)

Mo 190 pm [Kr] 5s¹4d⁵

W 193 pm [Xe]6s²5d⁴4f¹⁴ (Anomalous electronic configuration seen due to relativistic effect )

Now the trend is Cr<Al<Mo<W.

The main reason behind that the size of the orbit. Down the group the size increases and thus the radii also increases. Cr has small radii than Al due to the poor shielding effect of d-orbital.

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Answer 2

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