Question

Explain
the
following


i)Gallium
has
higher
ionization
enthalpy
than
aluminium


ii)Boron
does
not
exist
as
B3+


iii)
Aluminium
forms
[AlF6]3-
whereas
[BF6]3-
in
not
formed.​

Answer 1

Answer:

The ionization enthalpy value of Ga is higher than Al due to the inability of d- and f- electrons, which have a screening effect to compensate for the increase in nuclear charge.

(ii) Boron has small size and sum of Δ

i

H

1

+Δ

i

H

2

+Δ

i

H

3

is very high. Boron does not form B

3+

ion therefore, give covalent compounds.

(iii) Al has vacant 3d-orbitals and can expand its co-ordination no and forms [AlF

6

]

3−

. On the other hand, Boron does not have orbitals and can not form [BF

6

]

3−

and cannot expand its covalence beyond 4 and thus, gives[BF

4

].

Answer 2

Answer:

I don't know sorry I'm not good on it