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Q.

The electronic configuration of Helium is

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a

1s22s22p6

b

1s2

c

1s22s22p63s23p6

d

1s22s2

answer is B.

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Detailed Solution

  • With the exception of helium, all other gases have outer electronic configuration ns2np6, where n varies from 2 to 6. 
  • The electronic configuration of helium is 1s2.
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