Question

compare the following elements as per the characteristics given in the brackets :
(a) lithium and nitrogen (atomic radii)
(b)potassium and chlorine (electro negativity )
(c)magnesium and calcium( valency) ​

Answer 1

Answer:

1. lithium has larger atomic radii.

2. chlorine is more electronegative than potassium

3. the valency of both is 2

Answer 2

Answers are given below:

Lithium has larger atomic radius as compared to nitrogen because in same period, it has less number of electrons as compared to nitrogen for same number of protons.

Less attractive forces cause bigger radius of lithium.

Chlorine has electronegativity of 3.16 while potassium has electronegativity of 0.82.

This happens due to decreased atomic radius, where nucleus has greater pull over electrons causing more electronegativity.

Magnesium and calcium both belong to group 2 of periodic table. They both have valency +2 due to two electrons in their outermost shell.