$P$-type semiconductors are made by adding which impurity element?

When the conductivity of a semiconductor is only due to the breaking of the covalent bonds,the semiconductor is called

In an intrinsic semiconductor,the density of conduction electrons is $7.07 \times 10^{15} \, m^{-3}$. When it is doped with indium,the density of holes becomes $5 \times 10^{22} \, m^{-3}$. Find the density of conduction electrons in the doped semiconductor.

When an impurity is doped into an intrinsic semiconductor,the conductivity of the semiconductor

What is the conductivity of a semiconductor sample having electron concentration of $5 \times 10^{18} \, m^{-3}$,hole concentration of $5 \times 10^{19} \, m^{-3}$,electron mobility of $2.0 \, m^2 \, V^{-1} \, s^{-1}$,and hole mobility of $0.01 \, m^2 \, V^{-1} \, s^{-1}$? (Take charge of electron as $1.6 \times 10^{-19} \, C$)

In the energy band diagram of a material shown below,the open circles and filled circles denote holes and electrons respectively. The material is