First slide

Atomic and physical properties

Question

Ionization enthalpy of elements of 13th group

Moderate

A

decreases from B to Al
B

very close for Al and Ga
C

slightly increases from In to Tl
D

all of these

Solution

$Ionisation energies order B > Tl > Ga > Al > In$
$Ga IE = 579 KJ / mol and Al IE = 577 KJ / mol almost same$
High IE for Tl is due to inert pair effect

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