Atom - Particles made up of protons, neutrons and electrons, Ion - An atom that has gained or lost an electron, Na+ - A sodium ion, Cl- - A chlorine ion, positive Ion - When an atom loses an electron it forms a..., negative Ion - When an atom gains an electron it forms a..., NaCl - Sodium Chloride (Salt), negative ions move freely when salt is dissolved in water - Salt water conducts electricity because..., Proton - Part of an atom that carries a positive charge, Neutron - Part of an atom that carries no charge, Electron - Part of an atom that carries a negative charge, An atom that has lost 2 electrons - Ca2+,

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