There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?(1 point)
Responses
Their number of protons differ.
Their number of protons differ.
They are radioactive, like all isotopes.
They are radioactive, like all isotopes.
Their atomic masses differ.
Their atomic masses differ.
The number of neutrons are the same.
The number of neutrons are the same.
Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?(1 point)
Responses
13
13
5
5
9
9
4
4