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Classification of Elements and Periodicity in Properties

Multiple Choice Questions

11.

Which of the following electronic configuration will have maximum IP difference between II^nd and III^rd ionisation potential?

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

12.

The Modern Periodic Table is based on the properties of elements as a function of

atomic number
atomic mass
electronegatvity
electron affinity

13.

Atomic radii of which metals are same?

Cr, Mn, Cu
Cr, Fe, Co
Sc, Ti, Zn
V, N, Cr

14.
The correct order of electron affinity of oxygen, sulphur, chlorine, fluorine is

S < O < Cl < F

S < O < F < Cl

O < S < F < Cl

O < S < Cl < F

O < S < F < Cl

Electron affinity is the amount of energy liberated when one extra electron is added to an isolated gaseous atom. It usually increases along a period and decreases along a group. Thus, the order of electron affinity should be

S < O < Cl < F

But F and O due to their smaller size has lower electron affinity as compared to Cl and S respectively. Thus, the correct order of electron affinity is-