Question

particle a has very little mass in comparison to particle b. both particles are in the same atom. which is the best conclusion about particles a and b? they have the same charge. they are located in the nucleus together. particle a has a positive charge, and particle b is neutral. particle a orbits the nucleus, and particle b is located in the nucleus.

Explanation:

In an atom, electrons (which have very little mass) orbit the nucleus. Protons and neutrons are in the nucleus and have much more mass. So if Particle A has very little mass compared to Particle B (which is likely a proton or neutron), Particle A (electron) orbits the nucleus and Particle B (proton/neutron) is in the nucleus. Electrons (- charge), protons (+ charge), neutrons (neutral) so they don't have same charge. Electrons aren't in nucleus. Electrons (-), protons (+), neutrons (neutral) so Particle A (electron -) can't have + charge and Particle B (proton + or neutron neutral) can't be as described in third option.

Answer:

Particle A orbits the nucleus, and Particle B is located in the nucleus.