Question

1. Difine atomic radius? How to change atomic radius in group and period?what are factors effect on the atomic radius?

Answer 1

Answer:

Explanation:

Atom is just like a sphere, atomic radius is same as radius of sphere.

Moreover, it is the distance between the last shell and nucleus.

 Atomic radius increases when -ve charge is decreased and decreases when -ve is increased.

In a period, -ve charge increases so, from left to right atomic radius decreases.

  for ease I have written wrt -ve charge, it is actually because of nuclear charge( +ve charge ).

Similarly, keeping the e- constant, when shells are increased, atomic radius increases. So, down to period, it increases.

 It is effected by nuclear charge , number of shells.

Answer 2

★ ATOMIC RADIUS ★

1) What is meant by Atomic Radius?

➙ Distance between nucleus of an atom and to it's outermost shell is termed as 'Atomic Radius'.

2) What are changes in Atomic Radius in group & period?

➙ In Periods, Atomic Radius goes on Decreasing from going left to right.

➙ In Groups, Atomic Radius goes on increasing from going down.

3) What are factors effecting on Atomic Radius?

➙ Atomic Radius is mainly factored by following reasons. They are :-

• Atomic No. of element

• Electronic Configuration of an element

• Valency of an element