Atoms consist of subatomic particles such as Protons, Electrons and Neutrons.
Electrons have a -1 charge and whizz around the orbitals of the atom. The orbitals take up most of the volume of the atom.
Protons and neutrons are found in the nucleus and it is very SMALL. The NUCLEUS takes up MOST of the mass of the ATOM.
All neutral atoms have no overall charge and have the number of Electrons is the same as the number of Protons.
Ions do have a charge, and the number of electrons are DIFFERENT to the number of protons.
NEGATIVE ions have more electrons. One more electron is added to a negative ion.
(e.g. Li3 has three electrons, add 1 more electron it now has 4 electrons and becomes Li-.
POSITIVE ions have fewer electrons. (e.g. Mg has 12 electrons, it loses 2 to have 10 electrons, so it is now Mg2+).
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