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Q.

The configuration 1s2,  2s2,  2p5,  3s1  shows

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a

Excited state of O2−

b

Excited state of neon

c

Excited state of fluorine

d

Ground state of fluorine atom

answer is B.

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Detailed Solution

The ground state of neon is 1s2,  2s2,  2p6 on excitation an electron from 2p jumps to 3s orbital. The excited neon configuration is 1s2,  2s2,  2p5,  3s1.
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