Question

Modern atomic theory states that the atom is a diffuse cloud of ________ surrounding a small, dense nucleus.
A) electron
B) neutron
C) proton
D) quark

Answer 1

electrons, hence the electron cloud

Answer 2

Answer:

Electron.

Explanation:

According to modern atomic theory, the electron position is not considered to be discrete  or fix. We say that there is probability of finding electron in particular area around the nucleus. so this we call as that atom is a diffuse cloud of electrons surrounding a small dense nucleus.

The electron density is maximum in shells.