Atoms
Structure: Protons and neutrons are found in the nucleus. Electrons orbit the nucleus in shells.
An atom contains equal numbers of protons and electrons. All atoms of an element have the same number of protons. Atoms of different elements have different numbers of protons.
Mass number=Number of Protons and Neutrons.
Atomic number=Number of protons.
Number of neutrons=Mass number-Atomic number.
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