π P Block Elements Short Notes
General Characteristics
β Location in Periodic Table: Groups 13-18 (p-block)
β Electronic Configuration: nsΒ² npΒΉβΆ (varies across the groups)
β Oxidation States: Varies widely due to the availability of d-orbitals in heavier elements
β Catenation: Carbon shows the highest tendency for catenation
β Allotropy: Common in elements like Carbon, Phosphorus, Sulfur
Group-wise Overview
Group 13: Boron Family
β Elements: B, Al, Ga, In, Tl
β General Properties:
β Boron is a metalloid; others are metals
β Oxidation states: +3 (B, Al), +1 and +3 (Ga, In, Tl)
β AlβOβ (amphoteric), BβOβ (acidic)
β AlClβ forms a dimer in the vapor phase
Group 14: Carbon Family
β Elements: C, Si, Ge, Sn, Pb
β General Properties:
β Carbon is a non-metal, Si and Ge are metalloids, Sn and Pb are metals
β Catenation strongest in Carbon
β SiOβ is a covalent network solid
β COβ (acidic), PbO (amphoteric)
Group 15: Nitrogen Family
β Elements: N, P, As, Sb, Bi
β General Properties:
β Nitrogen is a gas, others are solids
β Shows oxidation states from -3 to +5
β NHβ (basic), HNOβ (strong acid)
β White phosphorus (Pβ) is highly reactive
Group 16: Oxygen Family (Chalcogens)
β Elements: O, S, Se, Te, Po
β General Properties:
β Oxygen is a gas; others are solids
β Oxidation states: -2 (common), +4, +6 (heavier elements)
β HβO (neutral), HβS (weak acid), SOβ (acidic)
β Ozone (Oβ) is a powerful oxidizing agent
Group 17: Halogens
β Elements: F, Cl, Br, I, At
β General Properties:
β Exist as diatomic molecules (Xβ)
β Strong oxidizing agents (Fβ > Clβ > Brβ > Iβ)
β HF (weak acid), HCl, HBr, HI (strong acids)
β React with metals to form ionic halides
Group 18: Noble Gases
β Elements: He, Ne, Ar, Kr, Xe, Rn
β General Properties:
β Inert gases with complete octet (except He: 1sΒ²)
β Very low chemical reactivity (except Xe and Kr, which form compounds like XeFβ, XeFβ)
β Used in lighting, welding, and cooling applications
Important Trends in P-Block
β Electronegativity: Decreases down the group
β Ionization Energy: Decreases down the group
β Covalency: Decreases with increasing atomic size
β Thermal Stability of Hydrides: Decreases down the group (e.g., NHβ > PHβ > AsHβ)
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