Question

An element has 2 electrons in the M shell.What is the atomic number of the element?

Answer 1

12.

bcoz Before M there is K and L

K shell contains 2 electrons, L shell contains 8 electrons

therefore 2+8+2=12.

》 12 is the atomic number of the element ....

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Answer 2

There are 2 electrons in the M shell.

It means that the K shell and L shell,which precede the M shell,are completely filled.The K shell can contain a maximum of 2 electrons and the L shell a maximum of 8 electrons.

Thus the electronic configuration of the element is

K L M

2 8 2

Hence,the total number of electrons in the atom is equal to 12(2+8+2)

Atomic number=number of protons=number of electrons that is 12