Question

5. An atom of an element has 2 electrons in the M-shell i.e., third shell. What
will be the atomic number of this element? Name this element. Find the
valency of this element. Also, find the number of neutrons in the atom of this
element.​

Answer 1

Answer:

Thus, the number of electrons in its aton is 2+8+2=12. Since the number of electron in a neutral atom is equal to the number of protons, therefore, the atomic number of this element is 12.