- Physical Sciences
the temperature at which a substance changes phase from a liquid to a gas at a specific or fixed pressure (STP). The pressure of the evaporated particles is equal to the atmospheric pressure at that point.
a bond formed when non-metal atoms share a pair of valence electrons to form a molecule.
electrons that have been emitted from the nucleus of an atom of a radioactive element.
a solid that forms as a product of the reaction between two aqueous solutions.
the introduction of halogen atoms into a compound by addition or substitution.