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 out to about 60,000 years. The atomic number of C is 6, and of N is 7. 14C and 14N have the same: Group of answer choices

The correct answer is - mass number.

Explanation:

The atomic number the number of electrons or protons present in a neutral atom.

Atomic number = Number of electrons = Number of protons

Whereas, the mass number the sum of the number of protons and the number of neutrons present in an atom.

Mass number = Number of protons + Number of neutrons

For C-14 and N-14:

C-14 isotope:

Atomic number = number of proton = number of electron = 6.

Mass number = 14

Number of neutrons = 14 - 6 = 8

In N-14 isotope:

Atomic number = number of proton = number of electron = 7

Mass number = 14

Number of neutrons = 14 - 7 = 7

Thus, these two isobars have same mass number.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.