The electronic configurations of some elements are given below. Name the elements. (i) 2, 8, 5 (ii) 2, 8, 8, 2 (iii) 2, 8, 1

Question

Philoid · Accepted Answer

(i) The electronic configuration is given as 2, 8, 5

The atomic number = total number of electrons

= 2 + 8 + 5 = 15

And, the element is Phosphorous with atomic number 15.
(ii) The electronic configuration is given as 2, 8, 8, 2.

The atomic number = 2 + 8+ 8 + 2 = 20.

And, the element with atomic number 20 is Calcium.
(iii) The electronic configuration is given as 2, 8, 1.

Then, atomic number is = 2+8+1 = 11.

And we know that the element is Sodium.