Atomic structure

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

particle      relative charge       relative massproton            +1                          1neutron            0                          1electron          -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 numberof electrons.

Atomic structure