Question

Beryllium atomic mass​

Answer 1

Answer:

9.012182 u

Explanation:

The actual measured mass of a beryllium-9 atom is 9.012182 atomic mass units (amu) and the expected mass is calculated to be 9.072429 amu. Therefore, the mass defect for a beryllium-9 nucleus is 0.0624 amu. (1 amu=

1.66

×

10

−

27

kg)