Compared to an electron, which particle has a charge that is equal in magnitude but opposite in sign?*

The mass of a proton is approximately equal to*

Which property decreases when the elements in Group 17 are considered in order of increasing atomic number?*

Any substance composed of two or more elements that are chemically combined in a fixed proportion is*

Which term refers to how strongly an atom of an element attracts electrons in a chemical bond with an atom of a different element?*

At STP, which substance has metallic bonding?*

What is the number of electrons shared between the carbon atoms in a molecule of ethyne?*

Which atom in the ground state has a stable valence electron configuration?*

What occurs when two fluorine atoms react to produce a fluorine molecule?*

Which gas sample at STP has the same number of molecules as a 2.0-liter sample of Cl₂(g) at STP?*

All atoms of uranium have the same*

The concentration of a solution can be expressed in*

Compared to the boiling point and the freezing point of water at 1 atmosphere, a 1.0 M CaCl₂(aq) solution at 1 atmosphere has a*

According to the kinetic molecular theory, which statement describes an ideal gas?*

Which physical change is endothermic?*