JEE Advanced Chemistry question

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

(A)Greater effective nuclear charge acting on outer valence electrons
(B)Greater effective nuclear charge is experienced because of the weak shielding of the nucleus by 4f-electrons
(C)Both (a) and (b)Correct
(D)None of the above

Answer: (C)

Solution

The 5d elements are preceded by the lanthanides, whose poorly-shielding 4f electrons fail to screen the nuclear charge effectively (the origin of the "lanthanide contraction"). This causes the 5d elements to experience an unusually high effective nuclear charge on

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-159644