ASAP. Which pair of elements will form an ionic bond. 1. carbon and oxygen

2.carbon and chlorine

3.nitrogen and oxygen

4.barium and chlorine

PLEASE HELP

How many neutrons does a atom of cobalt have?

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin

What if it is did darwin used to support his theory of evolution