Question

which subatomic particle does the green circle represent?*

Explanation:

In an atom, protons (positive charge) and neutrons (neutral charge) are located in the nucleus. Electrons (negative charge) orbit around the nucleus. The green circles are in the nucleus (along with protons which are pink with + sign). Neutrons have no charge and are found in the nucleus. Protons are positively charged (pink +), electrons are negatively charged (yellow -) and orbit. So green is neutron.

Answer:

neutron