【】How many shells are there in 1s2 2s2 2p6 3s2 3p1?

 How many shells are there in

 1s2 2s2 2p6 3s2 3p1?



Answer:
There are three shells in 1s2 2s2 2p6 3s2 3p1.

●First shell
1s2

●Second shell
2s22p6

●3rd shell
3s23p1

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