Protons and neutrons are the heaviest particles in an atom and as a result they make up most of the mass of the atom. If you Change the number of neutrons in an atom it becomes an isotope, change the number of electron and it becomes an ion. Take quiz to see how well you understand isotopes and ions.
N3-
O2-
O3-
F-
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Add one electron
Remove one proton
Remove one electron
Add one neutron
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16 O 8
17 O 8
18 O 8
18 O 9
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Anions
Cations
Isotopes
Molecules
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Ions
Isotopes
Elements
Atoms
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7 protons and 4 electrons
7 protons and 10 electrons
7 protons and 11 electrons
8 protons and 11 electrons
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0
1
2
3
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4, 5, 2
4, 3, 4
4, 3, 6
4, 4, 2
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