MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Hydrogen molecule. Model of a hydrogen molecule, consisting of two hydrogen atoms (spheres) joined by a chemical bond (white tape, centre). Hydrogen is a flammable gas. It is the simplest of the chemical elements, with each atom being only a single electron bound to a single proton.
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