number of neutrons

What is the relative abundance for these isotopes?
The naturally occurring isotopes of Boron are 10B and 11B. The atomic masses of these isotopes are 10.013 amu and 11.009 amu. What is the relative abundance of each of these isotopes?  … Read more

How do you calculate the number of neutrons given the isotope mass and relative abundance?
Isotope Mass one: 40
Relative Abundances one: 11%

Isotope Mass two: 42
Relative Abundances two: 86%

Isotope Mass three: 44
Relative Abundance three: 3%  … Read more