Question

what is Hydrogen ?

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Answer 1

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Hydrogen is a chemical elements which is nonmetallic gaseous chemical element with atomic that is the simplest and lightest of the elements and that is used especially in the processing of fossil fuels and the synthesis of ammonia see Chemical Elements Table compare deuterium, tritium .

Answer 2

Answer:

Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass.

Symbol: H

Atomic mass: 1.00784 u

Atomic number: 1

Electron configuration: 1s1

Electronegativity: 2.2

Discoverer: Henry Cavendish

A hydrogen atom is shown as H• because of its one valence electron. The structures of molecules that are held together by covalent bonds can be diagrammed by Lewis electron-dot structures . ... The shared pair of electrons is shown as two dots in between the two H symbols (H:H).

A hydrogen atom is made up of a nucleus with charge +1, and a single electron. Therefore, the only positively charged ion possible has charge +1.

Gaseous hydrogen, with a density of 0.00523 lb/ft3, has a specific gravity of 0.0696 and is thus approximately 7% the density of air. For liquids, water (with a density of 62.4 lb/ft3; 1000 kg/m3) is used as the reference substance, so has a specific gravity of 1.0 relative to itself.