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Hydrogen is a chemical element; it has symbol H and atomic number 1. It is the lightest element and, at standard conditions, is a gas of diatomic molecules with the formula H 2, sometimes called dihydrogen, [11] hydrogen gas, molecular hydrogen, or simply hydrogen. It is colorless, odorless, [12] non-toxic, and highly combustible.
Depiction of a hydrogen atom showing the diameter as about twice the Bohr model radius. (Image not to scale) A hydrogen atom is an atom of the chemical element hydrogen.The electrically neutral hydrogen atom contains a single positively charged proton in the nucleus, and a single negatively charged electron bound to the nucleus by the Coulomb force.
1 H hydrogen (H 2) use: 20.271 K: −252.879 °C: −423.182 °F WebEl: 20.28 K: ... Periodic Table format. Boiling point of the elements in the periodic table.
The periodic table, ... The chemical elements are what the periodic table classifies and organizes. Hydrogen is the element with atomic number 1; helium, ...
Hydrogen readily loses and gains an electron, and so behaves chemically as both a group 1 and a group 17 element. Hydrogen (H) is the most abundant of the chemical elements, constituting roughly 75% of the universe's elemental mass. [1] Ionized hydrogen is just a proton. Stars in the main sequence are mainly composed of hydrogen in its plasma ...
Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity. For more detailed information about the origins of element names, see List of chemical element name etymologies.
The most common values of atomicity for the first 30 elements in the periodic table are as follows: ... Hydrogen (H) 2 2 Helium (He) 1 3 Lithium (Li) 1 4 Beryllium ...
In the following table, ... 1 H hydrogen (H 2) use: 13.99 K: −259.16 °C: ... Melting point of the elements in the periodic table [a] [b]