Answer the following question from given electronic configuration.
Elements | Electronic configuration |
A | 1s2 , 2s2 2p6 , 3s1 |
B | 1s2 , 2s2 2p6 , 3s2 3p6 , 4s1 |
C | 1s2 , 2s2 2p6 , 3s2 3p5 |
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