# Which elements are all highly reactive and are never found in Elemental forms in nature? Because of this, they are usually stored in mineral oil or kerosene (paraffin oil).

Jun 11, 2017

To prevent these reactive metals from reacting with the oxygen, the pure metals are often stored in oils. In nature, these metals occur only in salts (metal-nonmetal compounds), such as $\text{NaCl}$, $\text{KCl}$, and $\text{KBr}$.