1
Atom
basic building block of chemistry.
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proton
inside the nucleus with a positive charge.
3
neutron
inside the nebulas with neutral charge
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electrons
orbit the nebulas with an negative charge.
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atomic number
the number that places an atom on the periodic table of elements.
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atomic mass
the average mass of atoms inside of an element.
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atomic nuculas
Dence central part of an atom.
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isotops
two or more forms of a same element that contain equal numbers of protons but different numbers of neutrons in their nuclei