MAKING ATOMS:
elctrons:a stable elementary particle present in all atoms, orbiting the nucleus in numbers equal to the atomic number of the element; a lepton with a negative charge of 1.6022x10--19 coulomb, a rest mass of 9.1096x10--31 kilogram, a radius of 2.818x10--15 metre, and a spin of ½
ISOTOPES OF HYDROGEN
a central or fundamental part or thing around which others are grouped; core
nucleus:
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