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Atom: smallest part of an element that can take part in a chemical change ­ no charge, neutral

Element: cannot be broken down by chemical means into other substances

Ion: atom or group of atoms that becomes electrically charged by the loss or gain of electron(s)

Molecule: smallest part of…

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Relative Isotopic Mass: mass of an atom of an isotope of an element on a scale where an atom of
carbon-12 is 12

Relative Molecular Mass/Relative Formula Mass: sum of the relative atomic masses of all the
atoms in its molecular formula

First Ionisation Energy: energy needed to remove 1…

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