Question

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

Answer 1

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

Hope that helps!

Answer 2

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.

Hope this Helps! :)