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reactions in which an atom or group of atoms is replaced in a molecule by another atom or group of atoms.
this consists of three separate layers of the Earth â the crust, the mantle and the core.
attracted to iron, cobalt or nickel, or forms a permanent or temporary magnetic field.
the transfer of electrons from one atom to another atom to form positive and negative ions...
a vertical column of elements in the periodic table which have similar properties.
a short way of writing the name of a chemical compound. It shows the composition of the compound...