What unit are nucleus measured in?

Answer 1

Atomic mass unit; protons and neutrons both weigh about 1 amu

1 amu equals approximately [1 gram / (6.023 * 1023)] = 1.66 * 10-24 grams

The angstrom (symbol Å) is often used to measure distances at the atomic scale.

1 angstrom = 10-10 meter, or 0.1 nanometer