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a vertical column of elements in the periodic table which have similar properties.
a temporary unstable high energy composition of atoms representing a transition step between the...
the sum of the number of protons and neutrons (the nucleons) in the nucleus of an atom. It...
bonds that form between the hydrogen atom of one molecule and an oxygen, nitrogen or fluorine...
reactions in which an atom or group of atoms is replaced in a molecule by another atom or group...
a halogen atom (F, Cl, Br or I) reacts by addition reaction with alkenes