What is the 5th element on the periodic table?

Boron – Element information, properties and uses | Periodic Table.

What are the 5 elements in the 5th element?

Some call it Spirit. Others call it Aether or Quintessence (literally “the fifth element” in Latin). In traditional Western occult theory, the elements are hierarchical: Spirit, fire, air, water, and earth—with the first elements being more spiritual and perfect and the last elements being more material and base.