Question

Electronic configuration of four elements are given in the table. Arrange
these elements in the increasing order of their electronegativity. Give
reason.
Elements
Electronic configuration
Na
2, 8, 1
S
2, 8, 6
Al
2, 8, 3
K
2, 8, 8, 1
​

Answer 1

Answer:

K < Na < Al < S

Explanation:

Given: Electronic configuration of elements.

Find: Increasing order of the electronegativity.

Solution:

The given elements are Sodium (Na) - 2, 8, 1

Sulphur (S) - 2, 8, 6

Aliminium (Al) - 2, 8, 3

Atomic number 19 is Potassium (K) - 2, 8, 8, 1. It must be a typo error stating R.

In the periodic table, the electronegativity increases as we move from left to right in a period.

So Sulphur is the most electronegative and Potassium is the least electronegative.

Order of electronegativity is: K < Na < Al < S