Which subatomic particle is the smallest?

Which subatomic particle determines what element you have?

Which subatomic particle can be added or subtracted to create an isotope?

The number of protons or electrons.

Define atomic mass.

Which of these represents part of a period on the periodic table of elements?

Which of these represents part of a family on the periodic table of elements?

How many valence electrons can be found in helium?

Which statement is true?

How did Dmitri Mendeleev originally arrange the periodic table?

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