When an ionic compound is named or its formula is written, what sort of element is placed first? what is the charge on its ions?

What is the mass of 4 molecules of co2

Which element would mostly likely have an electron affinity measuring closest to zero

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering