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The statement that is not correct for pe...

The statement that is not correct for periodic classification of elements is

A

The properties of the elements are the periodic function of their atomic numbers

B

Non-metallic elements are lesser in number than the metallic elements

C

the first ionisation energies of elements along a period do not vary in a regular manner with increases in atomic number

D

For transition elements the d-subshells are filled with the electrons monotonically with increases in atomic number.

Text Solution

Verified by Experts

The correct Answer is:
D
for ionisation elements d-subshell are not filled with electrons monotonically (one at a time) because of extra stability of `d^(5)` and `d^(10)` configurations. Besides these, there are many other exceptions e.g. Nb,Mo,Ru,Rh,Pd,etc.
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