Question

An electron is approximately 0.05% of the mass of a proton. Protons and neutrons each have a mass of 1 amu. Which of the following best describes the relationship between mass and subatomic particles?
A. The mass of an electron is equal to that of a neutron
B. Atomic mass is the total number of protons and electrons
C. A neutron has 0.05% more mass than an electron
D. The nucleus comprises over 99% of the atom's mass

Answer 1

Answer:

D. The nucleus comprises over 99% of the atom's mass.

Explanation:

Which of the following best describes the relationship between mass and subatomic particles?

A. The mass of an electron is equal to that of a neutron.  FALSE. The mass of an electron is ≈1/1,840 of that of a neutron.

B. Atomic mass is the total number of protons and electrons.  FALSE. Atomic mass is the total number of protons and neutrons.

C. A neutron has 0.05% more mass than an electron.  FALSE. A neutron has 0.05% more mass than a proton.

D. The nucleus comprises over 99% of the atom's mass. TRUE. The nucleus comprises protons and neutrons.