The elements shown have an atomic mass of 20 amu is Neon.
What is atomic mass?
The atomic number of an atom is its total number of protons and neutrons.
Neon has an atomic mass of about 20 this isotope contains 10 protons and 10 neutrons.
Actually, Neon would be listed as having an atomic mass of about 20.18 because of a mixture 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 are also 10 neurons in the nucleus of the major isotope which gives it 20Ne.
Hence, option D is the correct answer.
Learn more about the atomic mass here:
https://brainly.com/question/11673503
#SPJ2
