Give origin of group $13$ elements
Boron is a typical non-metal.
Aluminium is a metal but shows many chemical similarities to boron. While gallium, indium, thallium and nihonium are almost exclusively metallic in character.
Boron is a fairly rare element, it mainly occurs as orthoboric acid $\left(\mathrm{H}_{3} \mathrm{BO}_{3}\right)$, borax $\left(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\right)$ and kernite $\left(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 4 \mathrm{H}_{2} \mathrm{O}\right)$.
In India borax occurs in Puga Valley (Ladakh) and Sambhar Lake (Rajasthan). The abundance of boron in earth crust is less than $0.0001 \%$ by mass.
There are two isotopic forms of boron ${ }^{10} \mathrm{~B}(19 \%)$ and ${ }^{11} \mathrm{~B}(81 \%)$.
Aluminium is the most abundant metal and the third most abundant element in the earth's crust ($8.3\%$ by mass) after oxygen ($45.5\%$) and $Si$ ($27.7\%$).
Bauxite $\left(\mathrm{Al}_{2} \mathrm{O}_{3} \cdot 2 \mathrm{H}_{2} \mathrm{O}\right)$ and cryolite $\left(\mathrm{Na}_{3} \mathrm{AlF}_{6}\right)$ are the important minerals of aluminium. In India it is found as mica in Madhya Pradesh, Karnataka, Orissa and Jammu.
Gallium, indium and thallium are less abundant elements in nature.
Which base among the following reacts with diborane to cleave it unsymmetrically ?
The molecular formula of felspar is
Explain atomic radius of elements of boron family.
Give structure of gaseous $AlCl_3$.
The ionic carbide is