
Hydrogen (H) is a chemical element of the periodic table, located in the group 1 and the period 1, and is having the atomic number 1. It is a colorless, odorless, tasteless, highly combustible gas, whose name comes from the Greek word “hydro” and “genes”, which means water forming. It is a reactive nonmetal. It is the lightest element and is the tenth most abundant element on earth.
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– s block |
FAQs on Hydrogen Element
Hydrogen |
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‣ What does hydrogen look like? Appearance: colorless gas |
‣ Who discovered hydrogen? When was hydrogen discovered? Discovery: Henry Cavendish (1766) Named by: Antoine Lavoisier (1783) |
‣ Where is hydrogen located on the periodic table?![]() Location: Hydrogen is found in the first column of the periodic table above the lithium element. |
‣ What is hydrogen’s atomic number? Atomic number (Z): 1 |
‣ What is hydrogen symbol? Symbol: H |
‣ What is hydrogen’s atomic weight? Standard atomic weight: [1.00784, 1.00811] conventional: 1.008 |
‣ What block is hydrogen in the periodic table? Block: s-block |
‣ What group does hydrogen belong to? Group: 1 (hydrogen and alkali metals) |
‣ What is hydrogen’s period number? Period: 1 |
‣ What is the covalent radius of hydrogen? Covalent radius: 31±5 pm |
‣ Hydrogen Van der Waals radius: 120 pm |
‣ What is hydrogen melting point? Melting point: (H2) 13.99 K (-259.16 °C, -434.49 °F) |
‣ What is hydrogen’s boiling point? Boiling point: (H2) 20.271 K (-252.879 °C, -423.182 °F) |
‣ Hydrogen critical point: 32.938 K, 1.2858 MPa |
‣ Hydrogen triple point: 13.8033 K, 7.041 kPa |
‣ How many electron shells does hydrogen have? Electrons per shell: 1 |
‣ What is the ground state electron configuration for hydrogen? Electron configuration: 1s1 |
‣ What is hydrogen ionization energy? Ionization energies:1st: 1312.0 kJ/mol |
‣ What phase of matter is hydrogen at room temperature? Phase (at r.t): gas |
‣ What is hydrogen density? Density (at STP): 0.08988 g/L when liquid (at m.p): 0.07 g/cm3 (solid: 0.0763 g/cm3) when liquid (at b.p): 0.07099 g/cm3 |
‣ Hydrogen magnetic ordering: diamagnetic |
‣ Hydrogen natural occurrence: primordial |
‣ What is the oxidation state of hydrogen? Oxidation state: +1 |
‣ What is the electronegativity value of hydrogen? Electronegativity: Pauling scale: 2.20 |
‣ Hydrogen heat of fusion: (H2) 0.117 kJ/mol |
‣ Hydrogen heat of vaporization: (H2) 0.904 kJ/mol |
‣ Hydrogen molar heat capacity: (H2) 28.836 J/(mol K) |
‣ Hydrogen molar magnetic susceptibility: -3.98 × 10-6 cm3/mol (298 K) |
‣ Speed of sound in hydrogen: 1310 m/s (gas, 27 °C) |
‣ What is the crystal structure of hydrogen? Crystal structure: hexagonal |
‣ Thermal conductivity of hydrogen: 0.1805 W/(m.K) |
‣ Hydrogen CAS number: 12385-13-6 1333-74-0 (H2) |
‣ Hydrogen vapor pressure
Vapor pressure | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 15 | 20 |
‣ How many hydrogen isotopes are there?
Main isotopes of hydrogen | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
1H | 99.98 % | stable | ||
2H | 0.02 % | stable | ||
3H | trace | 12.32 y | β– | 3He |
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