Hydrogen does not contain neutrons.
Proton- relative mass= 1, relative charge= +1
Nuetron- relative mass=1, Relative charge= 0
Electron- Relative mass = 0, Relative charge= -1
Atom has the same number of protons as electons
The bottom number is atomic number = the number of protons
Top number is mass number = Total number of protons and neutrons
Isotopes = atoms of the same element with different numbers of neutron
They have the same chemical properties, same atomic number bu different mass number
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