Question

What is the expected mass (in kg) of a 10 over 5 B isotope?

1 proton = 1.6726 × 10-27 kg
1 neutron = 1.6749 × 10-27 kg

A.1.67 × 10-26 kg

B.1.67 × 1026 kg

C.2.51 × 10-26 kg

D.2.51 × 1026 kg

Answer 1

Bottom number is atomic number, the atomic number is the number of protons in an atom and it dictates an atoms identity

Top number is the atomic mass

atomic mass = protons + neutrons

Answer 2

Hope this helps