Question

The radioisotope carbon-14 differs from carbon-12 because:

A. It’s nucleus is heavier due to two more protons

B. It’s nucleus is heavier due to two
more electrons

C. It’s nucleus is lighter due to two fewer neutrons

D. It’s nucleus is heavier due to two more neutrons

E. It’s nucleus is lighter due to two fewer protons

F. It’s nucleus is lighter due to two fewer electrons

Answer 1

Answer:

D. It's nucleus is heavier due to two more nuetrons

Explanation:

Carbon-14 is an isotope of carbon. The '14' in carbon-14 is it's mass. The mass is the sum of the protons + neutrons (electrons excluded because they have virtually no mass - equal to 1/1836) so the nucleus must be heavier than that of carbon-12. All isotopes of carbon have the same number of protons, if it had fewer or more protons it would be a different element and not carbon.