|The curved upper surface of a column of liquid is the ____.
|A group of atoms held together by covalent bonds is a ____.
|The molecular attraction between dissimilar molecules is ____.
|An ____ is a negatively charged subatomic particle.
|One atom of the C-12 isotope has an ____ of 12.000 amu.
|An element's ____ is the number of its protons.
|An element's ____ is the number of its protons plus neutrons.
|A ____ is a positively charged subatomic particle.