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What important number in an atom distinguishes that atom from every other type of atom?
Wiki User
∙ 12y ago
I believe the Proton Number (being the number of protons in the centre/nucleus of the atom) is the most important number in an atom.
Oxygen for example has 8 protons and 8 neutrons. if it had more/less neutrons it would still be oxygen (it would be an ISOTOPE of oxygen) but if it had more/less protons, it would be a differnet element entirely.
Ordinarily, the number of protons in an atom matches the number of electrons spinning around the outside so as to keep it neutral. (a proton has a positive charge and a neutron has a negative charge)
the relative Atomic Mass of an element is the proton number + the neutron number as electrons weigh so little their mass is not worth taking into account.
Wiki User
∙ 12y ago
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