How are elements in the same group in the periodic table alike? A. They have the same chemical symbol.
B. They have similar chemical properties.
C. They have the same color in nature.
D. They have similar atomic masses.

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.

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.