Question

what are the 3 fundamental principles of atoms?​

Answer 1

Answer:

We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles, such as quarks.

Explanation:

We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles, such as quarks.

Answer 2

Answer:

proton, electrons and neutrons