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Extremely reactive, containing one valence electron, and is never found in their pure form.
Atoms of elements that have the same number of protons but a different number of neutrons inside the nucleus
Charged particles that form during chemical changes. They form when one or more valence electron is transferred.
a number placed in front of a molecular formal to indicate how many molecules/atoms take part in the reaction.
Law of Conservation of mass
in a chemical change, the mass of reactants at the start is equal to the mass of the products
occur when substances are changed to another phase, are separated or combined. No new substance is produced
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