Group 13 Elements: The Boron Family

 The atomic radius of gallium is more than that of aluminium.

What is the reason behind gallium having less atomic radius than aluminium?

Aluminium, being able to form $+3$ ions easily, is more electropositive than thallium.

Predict the formation of ${\mathrm{M}}^{3+}$ ion in the solution and compare the electropositive character of two metals, if the standard electrode potential values, ${\mathrm{E}}^{⊝}$ for ${\mathrm{Al}}^{3+}/\mathrm{Al}$ is $-1.66 \mathrm{V}$ and that of ${\mathrm{Tl}}^{3+}/\mathrm{Tl}$ is $+1.26 \mathrm{V}$.

The boiling point of gallium is quite high.

What is the boiling point of gallium?

Explain the hexagonal structure of boron nitride.

Write the reaction of boron with dinitrogen.

Write the reaction of aluminium with dinitrogen.

Which of the following metallic oxides exhibit amphoteric nature?

Does boron form covalent compound or ionic?

The characteristic valence shell configurations of group-$13$ and $14$ elements are respectively

Describe the general trends in the following properties of the elements in groups $-13$ and $-14$: Oxidation states.

Describe the general trends in the following properties of the elements in groups $-13$ and $-14$: ionisation enthalpy.

Describe the general trends in the following properties of the elements in groups -$13$ and $14$

Atomic size

Write short note on the following, 

Halides of elements of group-$13$.

Write short note on the following, 

Nature of oxides of elements of group-$13$.

How is the electronegativity vary among the elements of group$-13$ and why?

Arrange the following in increasing order of Lewis acid Character.

${\mathrm{BF}}_3, {\mathrm{BCl}}_3, {\mathrm{BBr}}_3$ and ${\mathrm{BI}}_3$