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what are isoptopes?

they are atoms of the same element that have the same number of protons but have different numbers of neutrons, or they have the same atomic number and have different mass numbers

what does the number next to isotopes signify?

it signifies the atomic mass

How can you tell isotopes apart?

they have different numbers of neutrons

what do all isotopes of an element have in common?

they all have the same number of protons

why are carbon-14 and nitrogen-14 not considered isotopes?

they have different numbers of protons