which pair of elements can be used to determine the age of a fossil that is over one billion years…

which pair of elements can be used to determine the age of a fossil that is over one billion years old?\nlead, which is radioactive, and uranium, which is stable\ncarbon, which is radioactive, and nitrogen, which is stable\nargon, which is radioactive, and lead, which is stable\npotassium, which is radioactive, and argon, which is stable

which pair of elements can be used to determine the age of a fossil that is over one billion years old?\nlead, which is radioactive, and uranium, which is stable\ncarbon, which is radioactive, and nitrogen, which is stable\nargon, which is radioactive, and lead, which is stable\npotassium, which is radioactive, and argon, which is stable

Answer

Brief Explanations:

Potassium - argon dating is useful for dating very old rocks and fossils over one - billion years old. Potassium is radioactive and decays into argon (stable). Carbon - nitrogen is not used for such old fossils as carbon - 14 has a relatively short half - life. Lead is not radioactive in the context of this dating method and uranium - lead dating is more for rocks than fossils in some cases.

Answer:

potassium, which is radioactive, and argon, which is stable