BRAINCAKEIsotopes
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
Most elements have more than one isotope.
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Key terms in this lesson
- Atomic number
- The number of protons in the nucleus of an atom.
- Mass number
- The number of protons and neutrons in the nucleus of an atom.
More in Atomic Structure
- Discovery of the Atom
- Structure of the Atom
- Relative Mass and Relative Charge
- Atomic Number and Mass Number
- Isotopes of Carbon
- Electrons
- Electron Shells
- The Mass Spectrometer
All 22 lessons in Atomic Structure · All AQA AS-level Chemistry topics