What are all the elements that form an anion Type all that apply
is it selenium, calcium, fluorine, iodine, potassium, rubidium, magnesium, sulfur, barium, and/or bromine?

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.