This exercise uses the radioactive decay model.

a wooden artifact from an ancient tomb contains 80% of the carbon-14 that is present in living trees. how long ago was the artifact made? (the half-life of carbon-14 is 5730 years. round your answer to the nearest whole number.)

i need the answer in yrs.

the answer to your question is c

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.