Question

The electronic configurations of four particles A, B, C and D given below:

A	2, 8, 8
B	2, 8, 2
C	2, 6
D	2, 8

Which electronic configuration represents:
(i) magnesium atom?
(ii) oxygen atom?
(iii) sodium ion
(iv) chloride ion?

Answer 1

(i) Electronic configuration of particle B represents magnesium atom because its atomic number is 12.

(ii) Electronic configuration of particle C represents oxygen atom because its atomic number is 8.

(iii) Electronic configuration of particle D represents sodium ion. Atomic number of sodium is 11 and it loses one electron to stabilise and forms sodium ion containing 10 electrons.

(iv) Electronic configuration of particle A represents chloride ion. Atomic number of Chlorine is 17 and it gains one electron to stabilise and forms chloride ion containing 18 electrons.