Answers

2016-03-21T22:17:32+05:30
No. of nuleons=mass no.=no. of [p{+}] + [n^{0}]
gn. A=39
n^{0}=39-19=20
and p^{+}=19
Electronic config. = 2,8,9
also 1s^{2} , 2s^{2} , 2p^{6} , 3s^{2} , 3p^{6} , 4s^{1}
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