Common hydrogen and at very high pressure hydrogen turns metallic (beta-hydrogen)
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One allotrope of hydrogen is known as orthohydrogen, which consists of molecules containing two hydrogen atoms with spins aligned in the same direction. Another allotrope is parahydrogen, in which the spins of the two hydrogen atoms are aligned in opposite directions. These allotropes have different properties due to their different nuclear spins.
No, ammonia is not an allotrope. Allotropes are different forms of the same element in the same physical state, while ammonia is a compound composed of nitrogen and hydrogen atoms.
No, ethane is not an allotrope. Allotropes are different structural forms of the same element, while ethane is a compound composed of carbon and hydrogen atoms.
No, H2O is not an allotrope. Allotropes are different forms of the same element that exist in the same physical state but have different properties. H2O is the chemical formula for water, a compound that consists of two hydrogen atoms and one oxygen atom.
Hydrogen gas (H2): Made up of two hydrogen atoms bonded together. Oxygen gas (O2): Composed of two oxygen atoms bonded together. Nitrogen gas (N2): Contains two nitrogen atoms bonded together.
From Wikipedia: "Allotropy or allotropism is a behavior exhibited by some chemical elements: these elements can exist in two or more different forms, known as allotropes of that element. In each allotrope, the element's atoms are bonded together in a different manner." Conversion, therefore (logically) would mean that one would be able to reduce the carbon allotrope to atoms and then re-assemble them into a different allotrope. For example, in order to form a diamond allotrope from a group of carbon atoms requires enormous amounts of pressure and temperature.