Question

Why there is a sudden increase in 4th ionzation energy value of Al but smooth gaps are between 1st and 2nd,2nd ,3rd?​

Answer 1

Aluminium is in Group 13 of the Periodic Table.

Its electron configuration is

1

s

2

2

s

2

2

p

6

3

s

2

3

p

.

By the time you have removed 11 electrons, you are down to an electron configuration of

1

s

2

.

This is a stable, complete shell, so extra energy is required to remove an electron from it.

The tenth, eleventh, and twelfth ionization energies of aluminium are 38 473, 42 646, and 201 266 kJ/mol, respectively.

It takes almost five times as much energy to remove the twelfth electron as it did to remove the eleventh electron.

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