Question

electronic configuration of four elements are given in the table arrange this elements in the increasing order of the electronic negativity
elements electronic configuration
na 2,8,1
s 2,8,6
al 2,8,3
r 2,8,8,1 ​

Answer 1

The increasing order of the electronegativity is : K < Na < Al < S

- On moving left to right in the periodic table, the electronegativity increases.

-Since Sulphur is at extreme right, so it has highest electronegativity.

- Aluminium is in the middle so its electronegativity is less than sulphur

- Sodium is at the left, so its electronegativity is less than aluminium.

- On going down in a periodic table, the electronegativity decreases.

- Since Potassium lies below sodium, so it has less electronegativity than sodium.

- So the increasing order becomes: K < Na < Al < S.

Answer 2

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