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atomic mass the wigth of an atom as the mass wigth.
atom the smallest unit of matter.
scintific evidence it is usualy accepted by scintific evidence.
protons it is particle of an atomm found inside the nucles.and it is positive chrged
neutrons it is a particle of an atom found in sidethe nucleus.
electrons it is a particle of an atom found out side the nucleus.and itis negative charged.
mass number the number of atomic=the number of protons=the number of electron.
nucleus the center part of an atom that contain most of the massand it consists of protons and neutrons.
Created by: meheret