The impurity atoms that can be used to dope pure silicon to create...

Pure silicon is a Group 14 element with four valence electrons.

To create a $p$-type semiconductor, silicon must be doped with a trivalent impurity (Group 13 element) which has three valence electrons. This creates an electron deficiency or a hole in the crystal lattice.

Boron and aluminium are Group 13 elements and act as acceptor impurities to form $p$-type semiconductors.

Phosphorus and antimony are Group 15 elements (pentavalent) and act as donor impurities to form $n$-type semiconductors.