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a vertical column of elements in the periodic table which have similar properties.
the scale used to compare the masses of atoms. Atoms are compared to carbon-12 atoms.
a bond formed when non-metal atoms share a pair of valence electrons to form a molecule.
centre part of an atom with positive charge concentrated in a tiny kernel.
in a chemical reaction no mass is gained or lost when substances react to form new products....
reactions that either simultaneously occur in both directions or that can be reversed by...