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  • The atomic radius of elements of which of these would be nearly same?

The atomic radius of elements of which of these would be nearly same?

Option: 1

Na, K, Rb, Cs


Option: 2

F, Cl, Br, I


Option: 3

Li, Be, B, C


Option: 4

Fe, Co, Ni, Cu


Answers (1)

best_answer

As we have learnt,

Physical Properties of Elements -

Atomic Volume

In moving from left to right in a period the atomic volume first decreases and then increases because of the following reasons:

  • As we move in a period from left to right, first the increase in nuclear charge overcomes the increase in the number of electrons. Thus, the atomic volume decreases.

  • But on moving further in a period, newly added electrons enter into the p orbitals and because of the high shielding power of s and p orbitals, atomic volume increases.

 

Li

Be

B

C

N

O

F

Ne

13

5

5

5

14

11

15

17

Na

Mg

Al

Si

P

S

Cl

Ar

24

14

10

12

17

16

19

24

 

In moving from top to bottom in a group, the atomic volume increases due to the increase of the number of shells.

-

Atomic radii of transition elements remain almost same in period. Therefore Fe, Co, Ni, Cu have nearly same atomic radii.

Hence, option number (4) is correct

Posted by

seema garhwal

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