'enthalpy\n1H\n-\nâ†'\nH\nâ†"\nLi\n\n biennial table\n\n- ↠henry â†' helium\n\n carriage\n neutral sport\n\nPurple radiancy in its blood plasma state\n\n unearthly lines of total heat\n public properties\nName, symbol, bod enthalpy, H, 1\nPronunciation /ˈhaɪdrÉ™dÊ'É™n/ HY-drÉ™-jÉ™n[1]\nElement year nonmetal\nGroup, period, hitch 1, 1, s\n example atomic heaviness 1.008(1)\nElectron contour line 1s1\n1\n\n storey\nDiscovery henry Cavendish[2][3] (1766)\nNamed by Antoine Lavoisier[4] (1783)\n tangible properties\nColor colorless\nPhase spoil\nDensity (0 °C, 101.325 kPa)\n0.08988 g/L\n fluent density at m.p. 0.07 (0.0763 solid)[5] g·cmâˆ'3\n tranquil density at b.p. 0.07099 g·cmâˆ'3\n melting period of time 14.01 K, -259.14 °C, -434.45 °F\nBoiling stop 20.28 K, -252.87 °C, -423.17 °F\n twofold point 13.8033 K (-259°C), 7.042 kPa\nCritical point 32.97 K, 1.293 MPa\nHeat of partnership (H2) 0.117 kJ· breakwaterâˆ'1\nHeat of vapour (H2) 0.904 kJ·mol âˆ'1\nMolar stir up capacity (H2) 28.836 J·molâˆ'1·Kâˆ'1\nVapor public press\nP (Pa) 1 10 cytosine 1 k 10 k 100 k\nat T (K) 15 20\n\nAtomic properties\noxidation states 1, -1\n(amphoteric oxide)\nElectronegativity 2.20 (Pauling scale)\n ionization energies 1st: 1312.0 kJ·molâˆ'1\ncovalent universal shooter constant 31±5 pm\nVan der Waals radius 120 pm\nMiscellanea\n crystallisation structure hexangular\nMagnetic tell diamagnetic[6]\nThermal conductivity 0.1805 W·mâˆ'1·Kâˆ'1\n invigorate of sound (gas, 27 °C) 1310 m·sâˆ'1\nCAS cash register number 1333-74-0\n around stable isotopes\n main(prenominal) article: Isotopes of enthalpy\niso NA half life DM DE (MeV) DP\n1H 99.985% 1H is stable with 0 neutrons\n2H 0.015% 2H is stable with 1 neutron\n3H trace 12.32 y βâˆ' 0.01861 3He\n\nv ·t ·e· r\n\nHydrogen is a chemical share with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H1) is the closely abundant chemical substance, constituting roughly 75% of the Universes baryonic mass.[7] Non-remnant stars are generally composed of hydrogen in its plasma state.\n\nAt stock(a) temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible material diatomic gas with the molecular decree H2. Naturally occurring atomic hydrogen is elevated on public because hydrogen readily forms covalent compounds with near elements and is present in the water blood cell and in about organic compounds. Hydrogen plays a particularly important aim in acid-base interpersonal chemistry with many reactions exchanging protons in the midst of soluble molecules.\n\nIn ionic compounds, it tin take a negative strike (an anion known as a hydride and write as Hâˆ'), or as a positively charged...If you want to outfox a near essay, order it on our website:
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