2. Atoms and the Periodic Table

Potassium consists of three isotopes, ³⁹₁₉K, ⁴⁰₁₉K, and ⁴¹₁₉K. Based on its atomic mass, which isotope of potassium is the most abundant?

Vanadium consists of two isotopes, ⁵⁰₂₃V and  ⁵¹₂₃V. If the atomic mass for copper on the periodic table is 50.942 amu, are there more atoms of ⁵⁰₂₃V and  ⁵¹₂₃V in a sample of vanadium?

Which of the following choices has the greatest atomic mass?