Atom - the smallest part of an element, Nucleus - found in the centre of an atom, Element - made up of one type of atom only, Proton - is positively charged (+), Neutron - has no charge, it is neutral (0), Electron - is negatively charged (-), The lightest subatomic particle - is the electron (1/1838), Orbit or Shell - is the name given to the path taken by the electron as it moves around the nucleus, Atomic number - tells the number of protons in an atom, Atomic mass number - is the total number of protons and neutrons in an atom, Isotopes - Atoms with the same atomic number but have a different atomic mass number., Stable atoms - The number of positive protons+) and number of negative (-)charge electrons are the same, Atomic Mass Number- Atomic Number - Tells the number of neutrons,

ATOMIC THEORY

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