Chemicool

H

1

1.0079
Hydrogen
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
Name Hydrogen Symbol H
atomic number 1 Atomic weight 1.0079
Density @ 293 K 0.0000899 g/cm3 Atomic volume 14.4 cm3/mol
Group Non-Metal discovered 1766

States
state (s, l, g) g
melting point 14.06 K boiling point 20.4 K
Heat of fusion 0.05868 kJ/mol Heat of vaporization 0.44936 kJ/mol
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Energies
1st ionization energy 1312 kJ/mole electronegativity 2.2
2nd ionization energy kJ/mole electron affinity 72.7711 kJ/mole
3rd ionization energy kJ/mole Specific heat 14.304 J/gK
heat atomization 218 kJ/mole atoms

Oxidation & Electrons
Shells 1 electron configuration 1s1
minimum oxidation number -1 maximum oxidation number 1
min. common oxidation no. -1 max. common oxidation no. 1
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Appearance & Characteristics
structure hcp: hexagonal close pkd color colorless
uses rocket fuel toxicity
hardness mohs characteristics diatomic,dens

Reactions
reaction with air vigorous, = H2O reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 none
reaction with 6M NaOH none
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Other Forms
number of isotopes 3 hydride(s) H2
oxide(s) H2O chloride(s) HCl

Radius
ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 37.1 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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Conductivity
thermal conductivity 0.18 J/m-sec-deg electrical conductivity 1/mohm-cm
polarizability 0.7 A^3

Abundance
source Water, methane rel. abund. solar system 10.446 log
abundance earth's crust 3.1 log cost, pure 12 $/100g
cost, bulk $/100g
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