Option 3 is correct, i.e. p-block.
- Modern Periodic Table:
- The Modern Periodic Table is classified into the following elements - p-block, s-block, d-block, and f-block.
- The p-block elements include chalcogens, pnictogens, halogens, inert gases.
- The 18th group is known as Inert gas, zero groups, Nonreactive gases.
- The 17th group is known as Halogen.
- The 16th group is known as Chalcogen.
- The 15th group known as Pnictogen.
- Pnictogen group refers to the choking property of nitrogen gas (as opposed to air, which contains oxygen as well as nitrogen).
- Nitrogen family elements consist of atoms having 5 electrons in their outer energy level. Two of the electrons are in the s subshell, with 3 unpaired electrons in the p subshell.
- The s-block elements include alkali metals and alkaline earth metals.
- The d-block elements include Transition elements.
- The f-block elements include Inner Transition Elements.


