The percent abundance of the three stable isotopes of neon, Ne-20 (19.9924401754 amu), Ne-21 (20.99384668 amu), and Ne-22 (21.991385114 amu), are 90.5
1) 90.5%, 5.0%, 4.5%
2) 5.0%, 4.5%, 90.5%
3) 4.5%, 5.0%, 90.5%
4) 90.5%, 4.5%, 5.0%