A(n) ___ is equal to the mass of a proton.
neutron
electron cloud
electron
nucleus
neutron
A neutron is equal to the mass of a proton.
The correct answer is "neutron." To arrive at this answer, we need to know the relative masses of the particles mentioned in the question. Here's a breakdown of each option:
1. Neutron: The neutron has a mass roughly equal to that of a proton. Both protons and neutrons are found in the nucleus of an atom. Their masses are each approximately 1 atomic mass unit (u).
2. Electron cloud: The electron cloud refers to the region surrounding the nucleus of an atom where electrons are likely to be found. Electrons are much smaller and have significantly less mass compared to protons and neutrons. Their mass is negligible relative to the mass of a proton.
3. Electron: The electron is a subatomic particle with a negative charge. It is significantly smaller and has much less mass than a proton or neutron. The mass of an electron is around 0.0005 atomic mass units.
4. Nucleus: The nucleus is the central, dense part of an atom containing protons and neutrons. While the mass of the nucleus is equal to the combined masses of the protons and neutrons, only the neutron is approximately the same mass as a proton.
Therefore, the neutron is the correct answer as it has a mass similar to that of a proton.