Question

x elemnt has 5 electeons in m shell so what is it"s atomic no.

Answer 1

If there are 5 electrons in m shell then it means that k and Lshell are completely filled.
Therefore
Electrons in k shell=2
Electrons in L shell=8
Electrons in m shell=5
Electrons in total=2+8+5=15
Therefore the atomic no.=15
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