Ionisation enthalpy (ΔiHi kj mol-1) for the elements of Group 13 follows the order

Question

Ionisation enthalpy (ΔiHi kj mol-1) for the elements of Group 13 follows the order (A) B > Al > Ga > In > Tl (B) B < Al < Ga < In < Tl (C) B < Al > Ga < In > Tl (D) B > Al < Ga > In < Tl

Tardigrade Admin · Accepted Answer

The decrease in ionisation enthalpy from B to Al is associated with increase in size. The observed discontinuity in the ionisation enthalpy values between Al and Ga, and between In and Tl are due to inability of d -and f-electrons, which have low screening effect, to compensate the increase in nuclear charge.

Q. Ionisation enthalpy $(Δ_{i} H_{i} kj m o l^{- 1})$ for the elements of Group $13$ follows the order

$B > A l > G a > I n > Tl$

$B < A l < G a < I n < Tl$

$B < A l > G a < I n > Tl$

$B > A l < G a > I n < Tl$

Q. Ionisation enthalpy (Δi​Hi​kjmol−1) for the elements of Group 13 follows the order

B>Al>Ga>In>Tl

B<Al<Ga<In<Tl

B<Al>Ga<In>Tl

B>Al<Ga>In<Tl

Q. Ionisation enthalpy $(Δ_{i} H_{i} kj m o l^{- 1})$ for the elements of Group $13$ follows the order

$B > A l > G a > I n > Tl$

$B < A l < G a < I n < Tl$

$B < A l > G a < I n > Tl$

$B > A l < G a > I n < Tl$