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Which of the following orbital sublevels are possible?  Choose all that apply.

Which processes describe a system releasing energy/becoming more stable?

Match each substance with the term that best describes it:

________________________ states that an atom is stabilized by having its highest occupied (valence) energy level filled.

Density is defined as the ________________ of a substance found in a given _____________.

Which of the following are made of atoms?  Choose all that apply.

Which elements are paired with the correct number of valence electrons?  Choose all that apply.

The Heisenberg Uncertainty Principle states that it is impossible to know the exact __________________ and _____________________ of a particle at the same time.

Atoms frequently gain or lose electrons to form ___________.

When multiplying or dividing numbers, the answer should have as many significant digits as the number with the ______________ significant digits; when adding or subtracting numbers, the answer should ______________.