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

Explanation:

B represents magnesium atom because it has atomic mass 12

C represents oxygen atom because it has atomic mass 8

D represents sodium ion because it has atomic mass 11 but 1 positive ion

A represents chlorine ion because it has atomic mass 17 but 1 negative ion