What is the atomic mass of neon?
Neon has an atomic mass of about 20 this isotope contains 10 protons and 10 neutrons.
Actually Neon would be lested as having an atomic mass of about 20.18 because of a mixute of isotopes.
Z= Atomic number the number of protons in the nucleus which defines the element. in this case Z=10 and this means neon but there is also 10 neurons in the nucleus of the major isotope whcich gives it ^20Ne. The other minor isotope is ^22Ne which has 12 neutrons and 10 protons in its nucleus.