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find the atom...

Question

find the atomic no. of the element that belongs to second group and has :
2 shells
3 shells
4 shells
6 shells

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Solution

Dear Student,

Group number 2
Number of shell : 2
Element: Beryllium ( Electronic Configuration: 1s2 2s2)
Number of shell : 3 Element: Magnesium ( Electronic Configuration: 1s2 2s2 2p6 3s2)
Number of shell : 4 Element: Calcium ( Electronic Configuration: [Ar] 4s2)
Number of shell : 5 Element: Strontium ( Electronic Configuration: [Kr] 5s2)

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