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a short way to represent the electron structure of an atom.
a property that, if changed, can change the chemical nature of a substance and how it reacts....
the time required for half the atoms present in an object have undergone radioactive decay and...
a chemical cell in which electrical energy from a battery is used to produce chemical reactions...
compounds that are different colours in acid and alkali environments.
the sum of the atomic masses of the atoms in a molecule.