At absolute zero, the entropy of a pure crystal is zero because kinetic energy is zero. At absolute zero of temperature there is complete orderly molecular in the crystalline substance. Therefore there is no randomness at 0 K and entropy is taken to be zero. However, unlike enthalpy of formation values, all standard entropy values are positive, because the absolute zero for entropy is the most ordered possible state. Additionally, this means that pure elements in their standard states do not have standard entropy of zero.