Question Description I need support with this Chemistry question so I can learn better. Boron has two naturally occurring isotopes, 10B with an atomic mass of 10.0129370 amu and 11B with an atomic mass of 11.0093054 amu. The atomic mass of boron is 10.81 (from the periodic table). The percent abundances of the boron isotopes are __________% 10B and __________% 11 B.