an atom has the electronic configuration of 1s2


An atom has the electronic configuration of .1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5. Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be:

(1) 35 and 45      

(2) 45 and 35  

(3) 40 and 40           

(4) 30 and 50

Ans: 35 and 45

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Physics: an atom has the electronic configuration of 1s2
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