Q: Because the masses of subatomic particles are so small, a new unit, called what, was defined?


Read this paragraph and choose the correct option from the provided answers:

Chadwick’s work resulted in a new understanding of the nucleus of the atom; it is comprised of both protons and neutrons. Because the masses of subatomic particles are so small, a new unit, called an atomic mass unit (amu), was defined. Protons and neutrons each have a mass of approximately one amu. The Table below describes the characteristics of the three subatomic particles we have discussed.

 Choices:

- atomic volume unit

- particle mass unit

- nuclear mass unit

- atomic mass unit


A:
atomic mass unit