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(+), electron - is negatively charged (-), neutron - has no charge, it’s neutral(0), the lightest subatomic particle - is the electron(1/1838), orbit or shell - is the name given to the oath taken by the electron as it moves around the nucleus , atomic number  - tell 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 - tell the number of neutrons ,

Atomic Theory

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