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9 Atoms
Term | Definition |
---|---|
Atom | the building block of all materials |
Atomic model | scientists’ representation of an atom |
Atomic number | the number of protons in a nucleus |
Atomic symbol | a short-hand notation for describing an atom |
Electron | a small, negatively charged particle; clouds of electrons surround the nucleus of an atom |
Mass number | the number of protons and neutrons in an atom |
Neutral | having no overall charge |
Neutron | a particle with no electric charge; it is found in the nucleus of an atom |
Nucleus | a group of neutrons and protons at the centre of an atom |
Proton | a positively charged particle in the nucleus |