General properties of p-block elements:

Atomic size:
       In p- block elements atomic size decreases from left to right. When we move down the group atomic size increases.
Example: Boron to Thallium

Ionization energy:
        In p-block elements ionization energy increases from left to right. when we move down the group ionization energy decreases.

Electronegativity:
        In p-block elements electronegativity increases from left to right. When we move down the group electronegativity decreases.

Electron affinity:
        In p-block elements electron affinity increases from left to right. when we move down the group electron affinity decreases.

Allotropy:
        Allotropy means one element can exist in many forms.