Atomic structure (very small electron mass)
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I can describe the physical characteristics of atoms, protons, neutrons and electrons.
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Electrons have a relative charge of -1 and roughly a relative mass of 0.0005 (very small).
Protons are found in the atomic nucleus, have a relative electric charge of +1, and a relative mass of 1.
Neutrons are found in the atomic nucleus, have no electric charge, and a relative mass of 1.
An atom has no electric charge as it contains equal numbers of protons and electrons to balance the charge.
The atom has a nucleus surrounded by electrons, with the nuclear radius much smaller than that of the atom.
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