Scientists Use Carbon Dating to Determine the Age of Fossils

Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died to within 60,000 years. The atomic numbers of C is 6 and of N is 7.
-¹⁴C and ¹⁴N have the same

A) atomic number.
B) number of protons.
C) mass number.
D) number of neutrons.
E) number of electrons.