Question

an atom has 4 electrons in its outermost shell .what will be the atomic number of this element if 1st and 2nd orbits are complete. find the valencey of the element?​

Answer 1

Maximum no. of Electrons in the first shell = 2

Maximum no. of Electrons in the second shell = 8

given: No. of Electrons left in the outermost shell is 4

we know atomic number = No. of Electrons....

Which is 2 + 8 + 4

therefore, Atomic number= 14

Valency = 4 (Electrons Left in the outermost shell)