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GCSE Chemistry Isotopes Q

Hi, could someone please explain the answer for this question.

Neon gas has a relative mass of 20.2 and is made up of two atoms: 1) mass number 20
atomic number 10
Ne
2) mass number 22
atomic number 10
Ne
Explain which of these isotopes is the most abundant.

Reply 1

absolutelysprout

moved to chemistry :smile:

Reply 2

username2975726

the relative mass is an average of the masses of the isotopes based on their abundances. since 20.2 is much closer to 20 than it is 22, what does this tell you about the relative abundances of Neon 20 and Neon 22?