Carbon-14 is the typical radioisotope used to date materials; however, it has a limitation to 40,000 years. a scientist who wants to date materials older than 40,000 years would most likely use ?

The answer would be uranium-238 hope this helps

Explanation:

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.