Item 4 the atomic number of an atom is the number of a. neutrons b. electrons and neutrons c. protons and neutrons d. protons

It's atom

Explanation:

An atom is the basic building block of matter. An atom is made up of three smaller parts: the proton, neutron, and electron.

Which item is the largest?

A)atom

B)electron

C)neutron

D)proton

astronomers such as edwin hubble.