Question

An atom has 7 electrons in its m- number of an atom will be ---------- (show how to prove

Answer 1

17

The atomic number of the element is 17 and the element is Chlorine.

There are 7 electrons in the M-shell of the atom of this element. This means that K and L shells are completely filled with electrons. K-shell can accommodate 2 electrons, L-shell can accommodate 8 electrons and M-shell accommodates 7 electrons (given). 

Therefore, total number of electrons = 2 + 8 + 7 = 17

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