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a table of the elements in which elements with similar chemical and physical properties are organised in groups and periods.
reactions in which two or more molecules react to form one molecule.
a measure of the amount of substance per unit volume. Unit: mol.dm-3
the radius of an atom from the nucleus to the outermost electrons.
a number that indicates how the atom will react during the formation of chemical bonds.
the energy liberated when an electron is added to an isolated, neutral atom in the gaseous state...