Question

unit 3 comprehensive quiz l
possible points: 5
which statement correctly describes the relative masses of the three main subatomic particles?
protons are heavier than neutrons, and electrons are nearly the same mass as neutrons.
electrons and protons have nearly the same mass, while neutrons are much heavier.
neutrons are massless, while protons and electrons have equal mass.
protons and neutrons have nearly the same mass, while electrons are much lighter.

Explanation:

Protons and neutrons are found in the nucleus of an atom and have nearly the same mass (proton mass ≈ 1.6726219 × 10⁻²⁷ kg, neutron mass ≈ 1.674927471 × 10⁻²⁷ kg). Electrons are much lighter, with a mass of about 9.10938356 × 10⁻³¹ kg.

Answer:

Protons and neutrons have nearly the same mass, while electrons are much lighter.