Proton - Positive charge, Electron - Negative charge, Neutron - No charge, Why is an atom neutral - same number of electrons and protons, Atomic number - Number of protons in the nucleus of an atom, Mass number - Number of protons and neutrons in the nucleus of an atom, Isotope - Atoms with the same number of protons different number of neutrons, Allotrope - Different forms of the same element in the same physical state, Ion - Charged particle as it has lost or gained electrons, James Chadwick - Discovered the neutron, Ernest Rutherford - positive nucleus and was orbited by electrons, Thomson - Plum pudding, Radius of an atom - 0.1nm 1 x10 -10, Radius of an nucleus - 1x10-14m, How many neutrons will Carbon 14 have  - 8, How many neutrons will carbon 12 have - 6, How many electrons with Mg2+ have - 10, How many electrons will Cl- have - 18,

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