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Magnetic Properties

First IE of 5...

Question

First IE of 5d-elements are higher than those of 3d and 4d-elements. This is due to

A

lesser effective nuclear charge is experienced because of the weak shielding of the nucleus by 4f-electrons

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B

greater effective nuclear charge is experienced because of the weak shielding of the nucleus by 4f-electrons

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C

both (A) and (B)

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D

none of the above

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Solution

The correct option is B greater effective nuclear charge is experienced because of the weak shielding of the nucleus by 4f-electrons
5d elements have almost the same radius as that of 4d due to lanthanide contraction but they experienced greater effective nuclear charge because of the weak shielding of the nucleus by 4f-electrons so they have higher IE.

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