Question

Each case.
How the following properties of element
vary when we go from left to right? state
reason in
• Tendency to lose election •Atomic radii
•valency:​

Answer 1

Answer:

ANSWER

(i) Atomic radius

On moving from left to right across a period, the atomic radius decreases.

With increase in atomic number, the nuclear charge increases but the number of shells in the atoms of all the elements in a period remains the same. The nuclear attraction of the outermost electron increases due to which the atomic radius decreases.

(ii) Electronegativity

On moving from left to right across a period, electronegativity increases.

With increase in atomic number, the nuclear charge increases but the number of shells in the atoms of all the elements in a period remains the same. The nuclear attraction of the outermost electron increases. Hence, tendency to attract shared pair of electrons increases from left to right in a period.

(iii) Ionisation potential

On moving from left to right across a period, ionisation potential increases.

With increase in atomic number, the nuclear charge increases but the number of shells in the atoms of all the elements in a period remains the same. The nuclear attraction of the outermost electron increases due to which ionisation potential increases.