Question

use the drop down to label correctly the parts of an atom.

Explanation:

Answer:

(From left - to - right, top - to - bottom for the labels)

1. The label pointing to the small black - circled particles (electrons) in the outer region: electron (matches "elec" hint)
2. The label pointing to the neutral particles in the nucleus: neutron (matches "neut" hint, likely a typo for "neutron")
3. The label pointing to the positively charged particles in the nucleus: proton
4. The label pointing to the outer circular region where electrons are: electron cloud (or just "electron" region, but more precisely electron cloud)
5. The label pointing to the nucleus (the central cluster of protons and neutrons): nucleus