Simple Description

An atom with the same number of protons but a different number of neutrons

Further Detail

Isotopes have the same number of protons (as this defines the atom) but a different number of neutrons and therefore a different mass. In the example below each isotope has the same number of protons but the mass number is different, indicating that these are isotopes.

Related Words:

• Atom
• Neutron
• Proton
• Relative atomic mass

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