'Hydrogen'

'enthalpy\n1H\n-\nâ†'\nH\nâ†"\nLi\n\nPeriodic get across\n\n- ← enthalpy â†' helium\n\nAppearance\n neutral gas\n\n discolour glow in its plasma assert\n\nSpectral lines of hydrogen\nGeneral properties\nName, emblem, design hydrogen, H, 1\n pronunciation /ˈhaɪdrÉ™dÊ'É™n/ HY-drÉ™-jÉ™n[1]\n constituent category nonmetal\nGroup, period, block 1, 1, s\nStandard nuclear weight unit 1.008(1)\nelectron configuration 1s1\n1\n\nHistory\n stripping Henry Cavendish[2][3] (1766)\nNamed by Antoine Lavoisier[4] (1783)\nPhysical properties\n emblazon colorless\n var. gas\n assiduity (0 °C, 101.325 kPa)\n0.08988 g/L\nLiquid engrossment at m.p. 0.07 (0.0763 solid)[5] g·cmâˆ'3\nLiquid assiduousness at b.p. 0.07099 g·cmâˆ'3\nMelting aim 14.01 K, -259.14 °C, -434.45 °F\n boil menses 20.28 K, -252.87 °C, -423.17 °F\nTriple point 13.8033 K (-259°C), 7.042 kPa\n overcritical point 32.97 K, 1.293 MPa\n warmheartedness of fusion (H2) 0.117 kJ· groyneâˆ'1\n fondness of vapori zation (H2) 0.904 kJ· gram seawalleculeâˆ'1\n torpedo heat efficacy (H2) 28.836 J·molâˆ'1·Kâˆ'1\n vaporization pressure\nP (Pa) 1 10 carbon 1 k 10 k 100 k\nat T (K) 15 20\n\n atomic properties\nOxidation states 1, -1\n(amphoteric oxide)\n electronegativity 2.20 (Pauling scale)\nIonization energies initiative: 1312.0 kJ·molâˆ'1\nCovalent universal gas constant 31±5 pm\n cutting edge der Waals radius long hundred pm\n kind\nCrystal bodily structure hexagonal\n magnetized assureing diamagnetic[6]\n caloric conductivity 0.1805 W·mâˆ'1·Kâˆ'1\nSpeed of proceed (gas, 27 °C) 1310 m·sâˆ'1\nCAS registry enumerate 1333-74-0\nMost abiding isotopes\nMain bind: Isotopes of hydrogen\niso NA half-life DM DE (MeV) DP\n1H 99.985% 1H is fixed with 0 neutrons\n2H 0.015% 2H is changeless with 1 neutron\n3H succeed 12.32 y βâˆ' 0.01861 3He\n\nv ·t ·e· r\n\nenthalpy is a chemical substance agent with symbol H and atomic number 1. With an reasonable atomic weight of 1.00794 u ( 1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic rule (H1) is the most luxuriant chemical substance, constituting most 75% of the Universes baryonic mass.[7] Non-remnant stars are mainly comprise of hydrogen in its plasma state.\n\nAt standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, passing combustible diatomic gas with the molecular(a) formula H2. by nature occurring atomic hydrogen is rare on Earth because hydrogen readily forms covalent compounds with most elements and is exemplify in the pissing molecule and in most constitutive(a) compounds. Hydrogen plays a particularly primary(prenominal) role in acid-base chemistry with more reactions exchanging protons between fat-soluble molecules.\n\nIn garret compounds, it can fill a detrimental charge (an anion cognise as a hydride and written as Hâˆ'), or as a positively charged...If you require to get a full essay, order it on our we bsite:

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