Nov 27, 2025 · The earliest known chemical property of hydrogen is that it burns with oxygen to form water; indeed, the name hydrogen is derived from Greek words meaning ‘maker of water.’

hydrogen, Lightest chemical element, chemical symbol H, atomic number 1. A colourless, odourless, tasteless, flammable gas, it occurs as the diatomic molecule H 2.

Oct 17, 2025 · The reaction between sulfuric or hydrochloric acid and an active metal like zinc is utilized to liberate hydrogen in the laboratory, but such hydrogen usually contains trace …

Introduction Hydrogen is the simplest of the chemical elements. It is also the most abundant element in the universe. Scientists use symbols to stand for the chemical elements. The …

Oct 30, 2025 · Hydrogen bonds are of great significance in determining the structure of biologically significant compounds, most notably proteins and deoxyribonucleic acid (DNA).

Nov 4, 2025 · Hydrogen bonds between nitrogenous bases in nucleotides on the two strands of DNA (guanine pairs with cytosine, adenine with thymine) give rise to the double-helix structure …

Hydrogen (H) “burning” initiates the fusion energy source of stars and leads to the formation of helium (He). Generation of fusion energy for practical use also relies on fusion reactions …

The hydrogen nucleus is made up of a particle carrying a unit positive electric charge, called a proton. The isolated hydrogen ion, represented by the symbol H +, is therefore customarily …

Nov 21, 2025 · hydrogen peroxide, (H 2 O 2), a colourless liquid usually produced as aqueous solutions of various strengths, used principally for bleaching cotton and other textiles and …

Oct 11, 2025 · hydrogen sulfide, colourless, extremely poisonous, gaseous compound formed by sulfur with hydrogen (see sulfur).