What is n-type semiconductor ?

A n-type semiconductor is:

Which type of charge carries are there in n-type semiconductor?

In a semiconductor, the concentration of electrons is 8xx10^13cm and that of holes is 5xx10^12cm^-3 . Is it p-type or n-type semiconductor?

Name an impurity which when added to pure silicon makes it n-type semiconductor.

Why can't we take one slab of p-type semiconductor and physically join it to another slab of n-type semiconductor to get a p-njunction?

What type of semiconductor is obtained when silicon is doped with boron?

Which type of charge carries are there in p-type semiconductors?