Modern atomic theory states that the atom is a diffuse cloud surrounding a small, dense nucleus. Identify which particle is in the nucleus. A) ion B) neutron C) electron D) free radical

The appropriate response is the neutron. Atom comprises of littler particles like electron, proton and neutron. These particles are called as fundamental particles. The atom contain nucleus at its center, which has emphatically charged protons and neutrons. Electrons are rotating around the core and they convey negative charge. Additionally, the neutron is a part in the nucleus.