Hydrogen and carbon do not create a new compound by themselves. To create a new compound, they would need to bond with atoms of more elements.
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An atom of hydrogen has one proton and one electron, with a mass of approximately 1 Atomic Mass unit. An atom of carbon has 6 protons, 6 neutrons, and 6 electrons, with a mass of approximately 12 atomic mass units.
The elements in CH4 are carbon (C) and hydrogen (H). In one molecule of CH4, there is one carbon atom and four hydrogen atoms.
Hydrogen cyanide (HCN) has a linear shape due to the arrangement of atoms. The carbon atom is in the center with a hydrogen atom bonded to it on one side and a cyanide group (composed of a carbon atom triple-bonded to a nitrogen atom) on the other side.
Hydrogen particles are smaller than carbon dioxide particles. Hydrogen has one proton and one electron in each atom, making it the smallest element. In contrast, carbon dioxide is a compound molecule composed of one carbon atom and two oxygen atoms, making it larger in size.
Carbon has a charge of -4 by itself. Each hydrogen atom contributes +1, so the net charge then, is -2.
Methane is composed of two elements: carbon and hydrogen. It has a chemical formula of CH4, indicating that it contains one carbon atom and four hydrogen atoms.