Uncombined

A hard, rare metal under standard conditions when uncombined, tungsten is found naturally on Earth almost exclusively in chemical compounds.

Consequently, platinum is often found chemically uncombined as native platinum.

Elemental boron is a metalloid that is found in small amounts in meteoroids but chemically uncombined boron is not otherwise found naturally on Earth.

It is formed in minor amounts in cosmic ray spallation nucleosynthesis and may be found uncombined in cosmic dust and meteoroid materials.

It is too reactive to be found uncombined in nature, but when isolated, is relatively stable in dry air at room temperature.

On Earth, the element forms about 78% of Earth's atmosphere and is the most abundant uncombined element.

While about 32 of the chemical elements occur on Earth in native uncombined forms, most of these occur as mixtures.