There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?(1 point)
They are radioactive, like all isotopes.
They are radioactive, like all isotopes.
The number of neutrons are the same.
The number of neutrons are the same.
Their atomic masses differ.
Their atomic masses differ.
Their number of protons differ.
Their number of protons differ.