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There are 3 isotopes of carbon which are carbon-12, carbon-13, and carbon-14.  The average atomic mass is 12.01.  Which isotope is most abundant?

There are 3 isotopes of hydrogen.  Name one of them and one fact about it.

Which of the following groupings contains ONLY representative elements?

Using the periodic table, determine the number of neutrons in 16O.

Match each term with its correct descriptioin

Match the term with its description

What do the initials IUPAC represent?

Match each term with its correct description

What is the charge of a nucleus of an atom?

Explain the difference between the original periodic law and the modern periodic law.