Question

Which isotope has the greater mass neon-20 and neon-22

Answer 1

You have to look at the number of protons each have: The greater the number of protons is, the greater the mass is.
Neon-20 have 20 protons, and neon-22 have 22 protons. Neon-22 have more protons than Neon-20, so the mass of Neon-22 is greater than the mass of neon-20.

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Answer 2

Neon-22 is the isotope with the greater mass.

P.S. When you have two isotopes of the same element, the one with the greater number will always have the greater mass

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