- Physical Sciences
a state in which the outer energy level of an atom of any element is completely filled with electrons, similar to that of a noble gas.
the heat of reaction or the change in heat when reactants form products during a chemical...
the phase in matter in which the particles are far apart and can move freely.
a method of separating mixtures based on differences in their boiling points.
the simplest type of pure substance that cannot be broken down into simpler components.