arrange the the following elements in increasing order of ionisation energy -
B, Al, Ga, In, Tl
Answers
Answer:
Studyrankersonline
Watch Sports LIVE
Ask a Question
Ionisation enthalpy (∆ tH1 kJ mol-1) for the elements of Group 13 follows the order.
0
votes
1 view
asked Mar 9, 2018 in Class XI Chemistry by vijay Premium (539 points)
Ionisation enthalpy (∆ tH1 kJ mol-1) for the elements of Group 13 follows the order.
(a) B > A1 > Ga > In > T1
(b) B < A1 < Ga< In <T1
(c) B < A1 > Ga < In < T1
(d) B > A1 < Ga > In < T1
the p-block elements
Please log in or register to answer this question.
1 Answer
0
votes
answered Mar 9, 2018 by rahul152 (-2,839 points)
d) On moving down the group from B to Tl, a regular decreasing trend in the ionisation energy values is not observed.
In Ga, there are ten d-electrons in the penultimate shell which screen the nuclear charge less effectively and thus, outer electron is held firmly. As a result, the ionisation energy of both A1 and Ga is nearly the same. The increase in ionisation energy from In to Tl is due to poor screening effect of 14f electrons present in the inner shell.