The electronic configuration of an element with atomic no., Chemistry

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Which of the following represents the electronic configuration of an element with atomic number 17:

(1) 1s2, 2s2, 2p6, 3s1, 3p6               

(2) 1s2, 2s2, 2p6, 3s2, 3p4, 4s1      

(3) 1s2, 2s2, 2p6, 3s2, 3p5              

(4) 1s2, 2s2, 2p6, 3s1, 3p4, 4s2

Ans:  1s2, 2s2, 2p6, 3s2, 3p5

 


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