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hydrogen – helium
 
H
Li  
 
 

General
Name, Symbol, NumberHydrogen, H, 1
Chemical series nonmetals
Group, Period, Block 1 (IA), 1 , s
Density, Hardness 0.0899 kg/m3Kilogram per cubic metre is the SI measure of density and is represented as kg/m³, where kg stands for kilogram and m³ stands for cubic metre. The density of water is about 1000 kg/m³, since a cubic metre of water weighs about a tonne. kg/m³" is sometimes, NA
AppearanceFor alternative meanings, see color (disambiguation). visual arts. Color (or colour is a sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view. The perception of colorless
Atomic properties
Atomic weightIn reference to a certain isotope of a chemical element, atomic weight (more accurately relative atomic mass though also called simply atomic mass is the mass of one atom of the isotope expressed in units atomic mass unit amu) such that the Carbon-12 isot 1.00794 amuThe atomic mass unit amu , unified atomic mass unit u , or dalton Da , is a small unit of mass used to express atomic masses and molecular masses. It is defined to be 1/12 of the mass of one atom of Carbon-12. Accordingly, :1 u 1/N gram 1/(1000 N) kg (whe
Atomic radiusAtomic radius is the distance from the atomic nucleus to the outmost stable electron orbital in a atom that is at equilibrium and is measured in picometers or Angstroms. Atomic radii are called covalent radii (a reference to the types of bonds formed) whe (calc) 25 (53) pmPicometre ( American spelling: picometer is an SI measure of length that is equal to 10−12 of a metre. Its symbol is pm and it is commonly used in measuring atomic-scale distances. Atom diameters are in the range from ~30 to 600 pm. 1 pm 1 × 10&minu
Covalent radiusCovalent radius in chemistry corresponds to half of the distance between two identical atomic nuclei, bound by a covalent bond. It is expressed in terms of pm or A. Chemistry. 37 pm
van der Waals radius 120 pm
Electron configuration 1s1
e- 's per energy level1
Oxidation states ( Oxide) 1 ( amphoteric)
Crystal structure hexagonal
Physical properties
State of matter gas
Melting point 14.025 K (−434 ° F)
Boiling point 20.268 K (−423 °F)
Molar volume 11.42 ×10-6 m3/mol
Heat of vaporization 0.44936 kJ/mol
Heat of fusion 0.05868 kJ/mol
Vapor pressure 209 Pa at 23 K
Speed of sound 1270 m/s at 298.15 K
Miscellaneous
Electronegativity 2.2 ( Pauling scale)
Specific heat capacity 14304 J/(kg*K)
Electrical conductivity __ 106/(m· ohm)
Thermal conductivity 0.1815 W/(m*K)
Ionization potential 1312 kJ/mol
Most stable isotopes
iso NA half-life DM DE M eV DP
1H99.985%H is stable with 0 neutrons
2H0.015%H is stable with 1 neutron
3H {syn.}12.33 y β-0.019 3He
4H{syn.}unknown n2.9103H
SI units & STP are used except where noted.

Hydrogen ( Latin: hydrogenium) is the chemical element in the periodic table that has the symbol H and atomic number 1. At standard temperature and pressure it is a colorless, odorless, non-metallic, univalent, highly flammable diatomic gas. Hydrogen is the lightest and most abundant element in the universe. It is present in water and in all organic compounds and living organisms. Hydrogen is able to react chemically with most other elements. Stars in their main sequence are overwhelmingly composed of hydrogen in its plasma state. This element is used in ammonia production, as a lifting gas, as an alternative fuel, and more recently as a power-source of fuel cells.

In the laboratory, hydrogen is prepared by reaction of acids on metals such as zinc. For production in large scale commercial bulk hydrogen is usually manufactured by decomposing natural gas. Electrolysis of water is a simple although inefficient method. Scientists are now researching new methods for hydrogen production. One of them involves use of green algae. Another promising method involves the conversion of biomass derivatives such as glucose or sorbitol, which can be done at low temperatures through the use of a new catalyst.



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Hydrogen Form Element Gas Water Forms

Topics: Hydrogen Form Element Gas Water Forms Deuterium Isotope...

Hydrogenhydrogen helium H Li Full table General Name, Symbol, NumberHydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1 (IA), 1 , s Density, Hardness 0. 0899 kg/m3, NA Appearance colorless Atomic properties Atomic weight 1. 00794 amu Atomic radius (caHydrogen bondIn chemistry, a hydrogen bond is a type of attractive intermolecular force that exists between two partial electric charges of opposite polarity. Although stronger than most other intermolecular forces, the hydrogen bond is much weaker than both the ionicHydrogen atomA hydrogen atom is an atom of the element hydrogen. It is composed of a single negatively charged electron, moving around the positively charged proton which is the nucleus of the hydrogen atom. The electron is bound to the proton by the Coulomb force.
Hydrogen peroxideProperties General Name Hydrogen peroxide Chemical formula H O Appearance Colourless liquid Physical Formula weight 34. 0 amu Melting point 272. 4 °C) Boiling point 423 K (150 °C) Density 1. 4 ×103 kg/ m3 Solubility miscible Thermochemistry ΔH0 -136Hydrogen cyanideProperties General Name Hydrogen cyanide Chemical formula H CN Appearance Colourless liquid Physical Formula weight 27. 0 amu Melting point 260 K (-13 °C) Boiling point 299 K (26 °C) Density 0. 7 ×103 kg/ m3 Solubility very soluble Thermochemistry ΔHydrogen sulfideProperties General Name Hydrogen sulfide Chemical formula H S Appearance Colourless gas Physical Formula weight 34. 1 amu Melting point 187 K (-86 °C) Boiling point 213 K (-60 °C) Solubility 0. 33 g in 100g water Thermochemistry ΔH0 -20. 5 kJ/ mol &
Hydrogen carrierHydrogen carHydrogenation
Hydrogen reformerHydrogen hypothesisHydrogenolysis
Hydrogen economyHydrogen-4Hydrogen-5


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