3.1.1.1 Particles

atomic number

number of protons

atomic mass

number of protons and electrons

relative isotopic mass

mass of an isotope relative to 1/12th a carbon-12 atom

isotope

an atom with the same number of protons and electrons but a different number of neutrons

relative atomic mass

mass of an atom relative to 1/12th a carbon-12 atom

relative molecular mass

sum of all the molecules relative atomic masses in a compound

what is the charge of an electron

-1

what is the charge of a proton

+1

what is the charge of a neutron

0

what is the mass of an electron

1/2000

what is the mass of a proton

1

what is the mass of a neutron

1