Question

15. The correct order for the mentioned property is
[NCERT Pg. 95]
(1) F- < 02- < S2- < Br - lonic radii
(2) Li > Na > K
Electropositive
character
(3) N > P > Sb > As
- Electron affinity
- Non-metallic
character
(4) Sn > Ge > Si > C​

Answer 1

Answer:

The correct order for the mentioned property is

[NCERT Pg. 95]

(1) F- < 02- < S2- < Br - lonic radii

(2) Li > Na > K

Electropositive

character

(3) N > P > Sb > As

- Electron affinity

- Non-metallic

character

(4) Sn > Ge > Si > C

Answer 2

Answer:

Option -1 has correct order for given property.

Explanation:

• 1) Ionic radii is the radius of ion.
• Generally as we go down a period the radius decreases.
• And as we go down a group the radius increases.
• But in ionic radius as the negative charge increases the radius also increases.
• But Br- have more electronegativity so it's an exception.
• So the order of ionic radii is F- < O2-<S2- <Br-
• 2) It is wrong as the order of electropositive character increases down the group.so order is K > Na > Li.
• 3) Electron affinity is the amount of energy liberated when an electron is added to an neutral atom.
• It increases across a period and decreases down the group.
• But in group 15 electron affinity increases down the group. Due to their half filled state.
• So the order should be : N < P < Sb < As.
• 4) Non metallic character decreases down the group. So the order is C > Si > Ge > Sn
• In these Carbon and silicon are non metals and Germanium is metalloid whereas tin is metal.

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