Question

three naturally occurring isotopes of neon exist. looking at the periodic table, which of the three isotopes of neon is the most abundant?
neon - 20
neon - 21
neon - 22

Explanation:

The atomic mass of neon on the periodic - table is approximately 20.18. Since the atomic mass is a weighted average of the masses of its isotopes, and neon - 20 is closest to this value, neon - 20 is the most abundant isotope.

Answer:

Neon - 20