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Isotopes

Isotopes are atoms of the same element with the same number of protons but a different number of neutrons.The atomic number - Z of an element is the number of protons in each atom.The mass number - A is the number of neutrons and protons in each atom.
isotopes of hydrogen:

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Specification: AQA Physics (7407), AS-level, 3.2.1.1 Constituents of the atom. Topic: Particles and Radiation.

Key terms in this lesson

Positron
The antiparticle of the electron: it has the same mass as an electron but a positive charge.
Neutrino
An uncharged, almost massless lepton that interacts only very weakly with matter and is emitted, along with a beta particle, in beta decay.

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