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  • The correct sequence of ionisation potential is:Option: 1 B > Li > KOption: 2

The correct sequence of ionisation potential is:

Option: 1

B > Li > K


Option: 2

K < Cs < Li


Option: 3

B < Li < Cs


Option: 4

Li < Cs < K


Answers (1)

best_answer

Ionisation Enthalpy or Ionisation Potential -

Variation of Ionisation Enthalpy

In moving from left to right in a period, the ionisation enthalpy increases. In period, the nuclear charge increases but the number of shells remain the same, thus the force of attraction between the nucleus and the outer electrons increases and hence the ionisation enthalpy increases. In a period, some elements like Be, Mg, N and P have exceptionally higher ionisation enthalpies than expected. This is because of their half filled or fully filled outer orbitals. 
 

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The first ionisation potential increases in moving from left to right in a period and decreases down the group.

Thus, the correct sequence is:
B > Li > K

Therefore, Option(1) is correct

Posted by

Shailly goel

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