First slide

Atomic and physical properties

Question

Which of the following is correct for Ga?

Moderate

A

Its size is smaller than that of Al
B

Its ionization enthalpy is very close to that of Al
C

Its m.p. is lowest in the family (only30^o C)
D

All of the above

Solution

Size of $Al is = 143 pm; Ga = 135 pm$
Ionisation enthalpy of $Al = 577 KJ / mol and Ga = 579 KJ / mol$
Melting point order $B > Al > Tl > In > Ga$
Gallium exist as liquid state during summer

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