p-Block Elements: Elements in which
the valence electron enters the p-orbital are called p-block elements.
Atomic Radii: The distance between the centre of the
nucleus and the outermost shell of the atom is called the atomic radii.
Ionic Radii: The distance between the centre of the
nucleus and the outermost shell of the ion is called the ionic radii.
Ionisation Potential: The energy required
to remove an electron from an atom in its gaseous phase is called ionisation potential.
Electronegativity: The tendency of an
atom in a molecule to attract a shared pair of electrons towards itself from
a covalent bond is called electronegativity.
Electropositivity: The tendency of an
atom to donate electrons from its outermost shell is called electropositivity.
Electron Affinity: The energy released when an extra
electron is added to a neutral gaseous atom is called electron affinity.
Bond Dissociation Energy: The amount of energy
required to break a bond in one mole of a gaseous substance is called the
bond dissociation energy.
Oxidising Agents: A substance which
accepts electrons and makes another substance lose electrons is called an oxidising agent.
Interhalogen Compounds of
Fluorine: Halogen fluorides are called interhalogen
compounds of fluorine.
Vulcanisation of Rubber: The process of
heating raw rubber with sulphur at a definite
temperature and for a definite time is called vulcanisation
Constant Boiling Mixture: In such mixtures,
the individual liquids have the same boiling points and the vapour of the mixture has the same composition as that of
the liquids. Such mixtures are also called azeotropic
Etching of Glass: The process in which permanent markings are
made on a glass surface is called etching of glass.
Hydrogen Bonding: The bonding in which a hydrogen atom is
attached to two electronegative atoms, to one by a covalent bond and to the
other by weak electrostatic attraction, is called hydrogen bonding.