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Question

Assertion: K, L, M, N orbits can accommodate maximum of 2, 8, 18, 32 electrons respectively.

Reason: The maximum number of electrons in particular orbit is given by 2n2, where n is orbit or shell number.


A
Assertion is true, but reason is false.
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B
Assertion is false, but reason is true.
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C
Both assertion and reason are true.
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D
Both assertion and reason are false.
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Solution

The correct option is C Both assertion and reason are true.

The maximum number of electrons that can be accommodated in any shell according to Bohr and Bury is 2n2 where n is the shell number.

Shell Maximum no. of electrons
K, n=1 2 × 12 = 2
L, n=2 2 × 22 = 8
M, n=3 2 × 32 = 18
N, n=4 2 × 42= 32

Hence, both assertion and reason are correct.


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