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Q.

What does the electronic configuration 1s2,2s2,2p5,3s1 indicate?

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a

Ground state of fluorine

b

Excited state of fluorine

c

Excited state of neon

d

Excited state of the O2−, ion

answer is C.

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Detailed Solution

The atomic number of neon is 10. Ground state, Ne(10)−1s2,2s2,2p6 Excited state, Ne (10)−1s2,2s2,2p5,3s1Hence, 1s2,2s2,2p5,3s1 electronic configuration indicates the excited state of neon.
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