Why are certain elements in the PeriodicTable classified as 'P-block' elements?

Question

'A' level Chemistry study

Answer 1

the elements in which the last electron enters the p-orbital r called p-block elements.
those r placed on the right hand side in the periodic table e.g.halogens.

Answer 2

These elements have the p orbital as the last orbital, i.e, the last orbital which is fully or half filled with electrons is the p orbital.

Similarly s and d block elements have their final orbitals as s and d orbitals respectively.