Question

An element has 2 shells and belongs to 2nd group .Find the atomic no. and write the subshell

electronic configuration.​

Answer 1

Answer:

Three shells are K,L,M. The subshells are 1s,2s,2p,3s,2p,3d

Group number: 17

Electrons in last shell: 7

Shell electronic configuration 2,8,7

Sub-shell electronic configuration 1s

2 ,2s 2 ,2p 6 ,3s 2 ,3p 5

Explanation:

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