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Classification of Elements and Periodicity in Properties

Multiple Choice Questions

321.

Atomic numbers of elements X, Y and Z are 50, 78 and 60 respectively. These elements are placed in modem long form of Periodic Table respectively in

p-block, d-block and f-block
p-block, d-block and s-block
s-block, p-block and d-block
s-block, d-block and f-block

322.

What is the electronic configuration of O^2- ion?

1s², 2s², 2p⁵, 3s¹
1s², 2s², 2p⁴, 3s²
1s², 2s², 2p⁶
1s², 2s², 2p⁴

323.

Among the following groupings which represent the collection of isoelectronic species.

NO⁺, C $_{2}^{2 -}$ , C $_{2}^{-}$ , CO
N₂, C $_{2}^{2 -}$ , CO, NO
CO, NO⁺, CN^-, C $_{2}^{2 -}$
NO, CN^-, N₂, O $_{2}^{-}$

324.
Which element has maximum first ionisation potential?

Cs

F

Na

He

Atoms and ions having inert gas configuration (such as helmm), i.e. stable (half-filled) configuration have high ionisation potential, i.e. it is relatively easy to remove an electron from a partially filled valence shell, where Z_eff is lower but it is relatively difficult to remove an electron from an atom or ion that has a filled valence shell, where Z_eff is higher.