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Coordination number
The number of coordinate bonds formed between the central metal ion and the ligands.
Electron affinity
Electron affinity is the energy change when one mole of electrons is added to one mole of gaseous atoms, forming one mole of gaseous 1− ions.
Electron configuration
It describes the arrangement of an atom’s electrons in its energy levels, sublevels and orbitals.
Electronegativity
The ability of an atom to attract a bonding pair of electrons in a covalent bond.
Group number
The group number of a main-group element indicates the number of valence electrons (electrons in the outermost energy level).
Ionisation energy
Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms.
Ligand
A ligand is a species (ion or molecule) that donates a lone pair of electrons to the central metal ion, forming a coordinate (dative) covalent bond.
Period number
The period number of an element tells you the highest principal energy level (n) that contains electrons.
Transition metal
An element that forms at least one ion with a partially filled d-subshell.