Question

Which of the following order is correct?

(A) Electronegativity : B > Tl > In > Ga > Al

(B) First Ionisation energy : B > Tl > Ga > Al > In

(C) Density : Tl > In > Ga > Al > B

(D) Size : B > Al > Ga > In > Al

(1) (A, B, C) only

(2) (B, C, D) only

(3) (A, B, D) only

(4) (A, B, C, D)

Answer 1

Correct option is : (1) (A, B, C) only

EN : B > Tl > In > Ga > Al

(2.0) (1.8) (1.7) (1.6) (1.5)

IE₁ : B > Tl > Ga > Al > In

(801) (589) (579) (577) (558) (in kJ/mol)

Density : Tl > In > Ga > Al > B

(11.85) (7.31) (5.9) (2.7) (2.35) (in g/ml)

Size : B < Ga < Al < In < Tl

(85) (135) (143) (167) (170) (in pm)