the spectrum of Sirius

H - Hydrogen

This flammable gas is lighter than air and the most abundant element in the universe. Henry Cavendish discovered that hydrogen was an element in 1766. Our students encounter hydrogen gas and ions.

Atomic number - 1 Density g/L 0 .08987
Atomic weight u 1 .0079 Melting point K 14 .025
Bonding radius A 0 .32 Boiling point K 20 .268
Atomic radius A 0 .79 Heat of vaporization kJ/mol 0 .44936
Ionization Potential V 13 .598 Heat of fusion kJ/mol 0 .05868
Electronegativity - 2 .2 Specific heat J/gK 14 .304
The oxide is amphoteric.
Crystal are hexagonal.

Electron config. : 1s1

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of H: Click mass number for decay process, product for element page.
001 99.985%

Stable

1.0078250 		002 0.015%

Stable

2.0141017 		003
12.33 yr
B-
He-3
3.0160492 		004
5.42 MeV
n,2.980 MeV
H-3
4.0279121 		MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.