Atomic structure

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the nuclear model of atoms includes the electrons orbiting in shells around the nucleus, consisting of protons and neutrons.

particle relative charge relative mass

proton +1 1

neutron 0 1

electron -1 0.0005

isotope: an atom which is the same element (same number of protons) but has a different number of neutrons.

standard notation of an atom:

12 C number of protons+neutrons.

6

^

proton number, number of protons in an atom.

if it is not ionic, it will have the same number

of electrons.

Atomic structure