Question

This graph represents that

a. atomic radii increases when we

move from top to bottom

b. atomic radii increases when we

move from left to right .

c. atomic radii decreases when we

move from top to bottom.

d. atomic radii decreases when we

move from left to right​

Answer 1

Answer:

Atomic radii of elements gradually increases in a group from top to bottom. As we go down a group, the atomic number increases, thus, the number of shells increases. Also, as we move down the group, the valence electrons are present in a higher shell and thus, the distance of valence electrons from the nucleus increases. As a result of this, the force of attraction between the nucleus and the valence electron decreases. Therefore, the atomic radius increases on moving down a group.

As we move across a period from left to right, the atomic radii decreases gradually. In a period, there is gradual increases in the nuclear charge from left to right. As the atomic number increases in a period, the electron enters in the same shell. Thus, they are more and more strongly attracted towards the nucleus. As a result of this force of attraction from the nucleus, the atomic radii gradually decreases.

Answer 2

Given :  graph  of atomic radii

To Find : This graph represents that

a. atomic radii increases when we  move from top to bottom

b. atomic radii increases when we  move from left to right .

c. atomic radii decreases when we  move from top to bottom.

d. atomic radii decreases when we  move from left to right​

Solution:

       

Atomic number

Na  - 11  

Mg - 12

Al   - 13

Si    - 14

P    - 15

S  -  16

Cl  - 17

Ar  - 18

atomic radii decreases when we  move from left to right​

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