I suppose that the question refers to chemical elements and their natural state. Indeed, some elements cannot be found "alone" (i.e., not combined) in natural state. This applies to the most reactive elements, such as fluorine (gas), chlorine (gas), sodium (alkali metal), etc.
the alkali metals, lithium, sodium, potassium, ruthenium, cesium, and francium
Plutonium is one.... It is created in fast-breeder nuclear reactors. And all the recently discovered heavier elements are also synthetic
Elements that are never found in their pure form in nature are reactive elements.
Alkali metals
Diatomic
Copper is an element which can be found in rocks, or it can be found in a relative pure state in nature called native copper, which is a mineral.
Only mercury is a chemical element which occur in the nature as a liquid.
The natural state of the element chromium is a solid metal. The natural state just indicates what the element is.
Volcanoes
Californium does not occur naturally. It is produced as a result of nuclear explosions and nuclear experiments.
Sulphur
Sodium, being a reactive element In group 1, cannot be found as element in nature. One of its common compounds is rock salt.
In a liquid elemental state or as an element contained in certain minerals.
Sodium is highly reactive and never exists in free state. It is always found in the combined state.
They're too reactive. They will react with oxygen or moisture in the air, so they can't exist as pure elements unless protected. The usual method is to submerse them in oil.
Copper is an element which can be found in rocks, or it can be found in a relative pure state in nature called native copper, which is a mineral.
Sodium (Na) is a highly reactive element so it cannot be found in free state but we can have it in compound form like NaCl.
Pure sodium is a soft metallic element. However, it is almost never found in this state in nature, since sodium is highly reactive. Sodium in usually found in salts of one sort or another, particularly sodium chloride, which is used as common table salt.
it the smallest element with one valence electron and will bond to just about anything, theres no scenario in nature where hydrogen would not have another element around to bond to
Alkali metals are extremely reactive and therefore are never found in their metallic state - only in compounds. As an example sodium metal is never found in nature only as compounds like salt etc.
Phosphorous is a chemical element that is always present in its oxidized state. It is never found as a free element. The primary source of phosphorous is in foods.
most elements have partly filled orbitals (or shells) and they try to gain, lose or share electrons so as to satisfy octet rule. Hence they are reactive and not generally found in free state