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Which of the following statements are co...

Which of the following statements are correct for classification of elements?
I. The properties of elements are periodic function of their atomic numbers.
II. Non-metallic elements are less in number than the metallic elements.
III. The first ionisation energies of elements along a period do not vary in a regular manner.
IV. The ground state electronic configuration of Pd (Z = 46 ) is [Kr] 4 d `5s^(2)`.

A

I,II,III, IV

B

I, II, III, only

C

II, III, IV only

D

I, II, IV only

Text Solution

Verified by Experts

The correct Answer is:
B
(I, II) Properties of elements are periodic function of their atomic number. Number of non-metals are less as compared to number of metallic elements.
(III) In periodic table, first ionisation energy of elements along a period do not vary in regular manner due to effective nuclear charge.
ground state electronic configuration of Pd [ Z = 46 ] is [Kr] `4d^(10) 5s^(0)`.
Hence, IV th statement is incorrect.
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