'It's 1 or 2 or more atoms of the same element that differ in atomic weight'
an isotope
CHEMISTRY: Its 1 or 2 or more atoms of the same element that differ in atomic weight
It's 1 or 2 or more atoms of the same element that differ in atomic weight
It's 1 or 2 or more atoms of the same element that differ in atomic weight
CHEMISTRY
an isotope
CHEMISTRY