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The element carbon.
Carbon
Hassium (Hs) itself is a chemical element.
This chemical element is carbon.
Helium is itself a chemical element and therefore is not found in any other chemical element.
narcissistium
Calcium is a chemical element. It is a chemical in itself and is a building block of other chemicals.
This question answers itself: "Hg" is the chemical symbol for the element mercury.
Silver is an element, thus it is composed of itself.
Hydrogen is, itself, a chemical element, and it is the most simple of all the elements. In hydrogen, one chemical element is present.
ionic
Carbon is an element. No element contains anything but itself.