6. The mass of an electron is approximately 9 x 10-28 grams, while the mass of a neutron is
approximately 2 x 10-24 grams. Which of the following is true?
a. The mass of a neutron is approximately 2,000 times the mass of an electron.
b. The mass of a neutron is approximately 20,000 times the mass of an electron.
c. The mass of a neutron is approximately 1,000 times the mass of an electron.
d. The mass of a neutron is approximately 10,000 times the mass of an electron.