- Physical Sciences
a reaction in which heat is absorbed from the surroundings and the temperature of the reaction mixture decreases when more energy is taken in than it releases.
an area or region where there is a high probability (95% chance) of finding electrons. Each...
spherical orbital that may contain a maximum of 2 electrons. Found in every energy level
the introduction of halogen atoms into a compound by addition or substitution.
the time required for half the atoms present in an object have undergone radioactive decay and...