uncombined
Adjective
Meaning
not joined or united into one
Source: WordNetSynonyms
Antonyms
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A hard, rare metal under standard conditions when uncombined, tungsten is found naturally on Earth almost exclusively in chemical compounds.
It is formed in minor amounts in cosmic ray spallation nucleosynthesis and may be found uncombined in cosmic dust and meteoroid materials.
Elemental boron is a metalloid that is found in small amounts in meteoroids but chemically uncombined boron is not otherwise found naturally on Earth.
Consequently, platinum is often found chemically uncombined as native platinum.
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.