Answers

  • Brainly User
2016-03-27T21:39:53+05:30
Option d is the right answer
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  • Brainly User
2016-03-27T22:10:16+05:30
The correct option is (d). 

1s 2 2s 2 2p 6 3s 2 3p 6 4s 1
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