Which of the following states that an orbital can contain two electrons only if all other orbitals at that sublevel contain at least one electron?

a).archimedes' principle
b).aufbau principle
c).hund’s rule
d).pauli exclusion principle
e).le chatelier's principle

Hund’s rule states that an orbital can contain two electrons only if all other orbitals at that sublevel contain at least one electron. The correct answer between all the choices given is the third choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.