C1 1.2 Chemical bondings

There are three types of chemical bondings – IONIC BONDING: The bonding between non-metal and metal Happens between oppositely charged ions Electrons are transfered Strong intermolecular forces COVALENT BONDING The atoms share a pair of electrons There is a electrostatic force which is very strong The intermolecular force is very weak Happens between non-metal and […]

1.1 14 Oxidation number

An oxidation number is a measure of the number of electrons that an atom uses to bond with atoms of another element. Oxidation numbers are derived from a set of rules. Oxidation numbers rules Uncombined element – C; Na; O2; P4 – the oxidation number is 0 Combined oxygen – H2O; CaO – the oxidation […]

Ionisation energy

Ionisation energy – means the energy required to remove 1 e– from every atom in a mole of gaseous atoms to from a mole of mono-positive atoms. or X(g) = X+(g) + e– Factors affecting ionisation enegy – Atomic radius : The greater atomic radius, the smaller the nulear attraction experienced by the outer electrons […]