QUIZ 1: GOLDEN YEARS TO MASTERS The man responsible for discovering that the atom is mostly space is:

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

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.

Compare and contrast physical changes with chemical changes.