Catenation: The tendency or the property of elements to
form bonds with itself is called catenation.
Allotropy: The existence of an element in two or more
forms in the same physical state is called allotropy. The different forms of
the same element are called allotropes.
Bond Energy: The average amount of energy per mole
required to break a particular bond in a molecule producing free atoms or
radicals is called bond energy.
Ionisation Potential: The energy required
to remove an electron from an atom in the gaseous phase is called Ionisation potential.
Electronegativity: The tendency of an
atom in a molecule to attract 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.
Hybridisation: The process of
mixing and recasting of different atomic orbitals
having nearly the same energies in an isolated atom to form a new set of
equal number of equivalent orbitals with maximum
symmetry and definite orientation in space is called hybridisation.
Semiconductor: A semiconducting
material has electrical conductivity intermediate between a conductor and an
p-block Element: Elements in which
the valence electron enters the p-orbital is called a p-block element.