Pure substance made up of one type of atom?

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid