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Atoms
An atom is the smallest unit of ordinary matter that forms a chemical element
Term | Definition |
---|---|
Proton | A proton is a subatomic particle with a positive electric charge and a mass slightly less than a neutron. |
Electron | The electron is a subatomic particle whose electric charge is negative one. |
Neutron | The neutron is a subatomic particle which has a neutral charge and a mass slightly bigger than a proton. |
Subatomic | smaller than or occurring within an atom. |
Mass number | Is the number of protons and the number of neutrons. |
Atomic number | The atomic number of an atom is the number of protons in the nucleus of an atom. |
Nucleus | The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. |