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Isotopes
Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number, but not in proton number.
Hydrogen
The lightest and most abundant element in the universe, consisting of one proton and typically one electron.
Nucleus
The dense central core of an atom, containing protons and neutrons, or the central part of a cell, containing the genetic material.
Hydrogen Atom
The simplest atom consisting of a single proton in the nucleus and a single electron bound to the nucleus.
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