Question

quarks are thought to be the building blocks of protons. which was most affected by the discovery of the quark? the estimated mass of a proton the observation that protons have a +1 charge the view that the atom cannot be broken down further than protons the theory that the nucleus of an atom contains protons and neutrons

Explanation:

The discovery of quarks showed that protons are made up of smaller - sub - atomic particles. This challenged the view that atoms cannot be broken down further than protons. The mass of a proton was already known in a general sense before quarks were discovered. The charge of a proton was also well - established. And the presence of protons and neutrons in the nucleus was already part of atomic theory.

Answer:

the view that the atom cannot be broken down further than protons