The true statement among the options provided is:
Their atomic masses differ.
Neon-20, neon-21, and neon-22 have different numbers of neutrons, which means their atomic masses are different. Specifically, neon-20 has 10 neutrons, neon-21 has 11 neutrons, and neon-22 has 12 neutrons.
The other statements are not correct because:
- While they are isotopes, only neon-21 and neon-22 are not stable, so it's not true that all isotopes are radioactive.
- The number of protons is the same for all three isotopes (10 protons).
- The number of neutrons does not remain the same; it varies between the isotopes.
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