Chemistry P-Block Elements Syllabus for NEET 2026

The p-block section forms one of the most concept-rich parts of Inorganic Chemistry because it includes elements with diverse physical properties, oxidation states, and chemical behaviour. From nitrogen and oxygen compounds to halogens and noble gases, this unit explains how electronic configuration influences reactivity and periodic trends across different groups.

This unit focuses on Group 13 to Group 18 elements and highlights important reactions, compounds, and exceptions. It also explains the unique behaviour shown by the first element of each group, which is an important concept for understanding deviations in chemical properties.

Electronic Configuration and Periodic Trends

P-block elements are characterised by the filling of electrons in p-orbitals of the valence shell. Their electronic configuration influences properties such as atomic size, electronegativity, ionization enthalpy, oxidation state, and bonding behaviour.

Across a period:

• Atomic size generally decreases

• Electronegativity increases

• Metallic character decreases

Down a group:

• Atomic size increases

• Metallic character increases

• Ionization energy generally decreases

The first element of each group often shows anomalous behaviour due to small size, high electronegativity, and absence of d-orbitals.

Group 13 to Group 18 Elements

The p-block consists of elements belonging to Groups 13 to 18 of the periodic table. These groups contain metals, metalloids, and non-metals, making the p-block one of the most diverse sections of the periodic table.

• Group 13 (Boron Family): Boron, aluminium, gallium, indium, and thallium.

• Group 14 (Carbon Family): Carbon, silicon, germanium, tin, and lead.

• Group 15 (Nitrogen Family): Nitrogen, phosphorus, arsenic, antimony, and bismuth.

• Group 16 (Oxygen Family/Chalcogens): Oxygen, sulfur, selenium, tellurium, and polonium.

• Group 17 (Halogens): Fluorine, chlorine, bromine, iodine, and astatine.

• Group 18 (Noble Gases): Helium, neon, argon, krypton, xenon, and radon.

These groups exhibit distinct trends in electronic configuration, oxidation states, reactivity, and compound formation, making them important for NEET Chemistry preparation.

Group 15 Elements and Nitrogen Family Compounds

Group 15 elements include nitrogen, phosphorus, arsenic, antimony, and bismuth. These elements show variable oxidation states and form several important compounds included in the NEET syllabus.

Nitrogen and phosphorus compounds are especially important because of their industrial and biological significance.

Important compounds studied include:

• Ammonia

• Nitric acid

• Phosphine

• Phosphorus halides

Questions are frequently asked from preparation methods, properties, and reactions of nitrogen family compounds.

Halogens and Noble Gases

Halogens are highly reactive non-metals with strong oxidizing properties. Fluorine, chlorine, bromine, and iodine show characteristic trends in reactivity, bond dissociation energy, and displacement reactions.

The unit also covers noble gases, which were once considered completely inert. However, compounds of xenon demonstrated that noble gases can also form stable compounds under specific conditions.

Important concepts include:

• Oxidizing nature of halogens

• Interhalogen compounds

• Trends in halogen reactivity

• Noble gas compounds and properties

These concepts help in understanding the characteristic behaviour of halogens and noble gases. 

Chemical Properties and Important P-Block Reactions

Chemical properties of p-block elements depend mainly on valence shell configuration and oxidation states.

You should focus on:

• Acidic and basic character

• Oxidation and reduction behavior

• Hydrides and oxides

• Stability of compounds

• Important reaction mechanisms

Understanding reaction patterns and periodic trends helps in distinguishing the behavior of different p-block elements and compounds.

P-Block Elements: Complete Study Resources By PW

Physics Wallah provides revision and practice resources to strengthen understanding of p-block reactions, periodic trends, and NCERT-based concepts.