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AIPMT PRELIMS2007Chemistry-Periodic Properties

AIPMT PRELIMS 2007 Chemistry Ionisation Energy Multiple Correct Question

Type: Multiple Correct-conceptual-Medium-Class 11

With which of the following electronic configuration an atom has the lowest ionisation enthalpy?

A

1s22s22p31\text{s}^2 2\text{s}^2 2\text{p}^3

B

1s22s22p53s11\text{s}^2 2\text{s}^2 2\text{p}^5 3\text{s}^1

C

1s22s22p61\text{s}^2 2\text{s}^2 2\text{p}^6

D

1s22s22p51\text{s}^2 2\text{s}^2 2\text{p}^5

Correct Answer

Option A

Detailed Explanation

Ionisation energy depends on atomic size, nuclear charge, shielding effect, and penetration effect. A smaller atomic size and higher nuclear charge increase ionisation energy, while greater shielding and penetration effects decrease it.

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