No, element is a unique existing in the universe. But elements are made up of sub atomic particles. Some sub atomic particles have mass and some other don't have. So simplest form of matter is the photon whose rest mass is zero. Yet it has momentum. That is the quantum of energy. Energy is the ultimate reality.
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It is an element.
Element
An element.
Elements
It is probably REFLEXIVITY. Reflexivity, defined on a set S requires that, for each element x in S, x ~ x. The simplest example of reflexivity is "is equal to".