Add or remove protons, neutrons and electrons; see what atom, isotope or ion you have made
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Protons1
Neutrons0
Electrons1
The element is decided by the number of protons only. Changing neutrons makes a
different isotope of the same element; changing electrons makes an ion
(fewer electrons than protons = positive ion, more = negative ion).
Electrons are drawn paired where pairs exist, filling shells 2, 8, 8, 2.