He Helium Index (original) (raw)

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Helium (He) Element Properties

Atomic Mass 4.002602
Atomic Number 2
Name Origins Greek, helios = "sun."
Year Discovered 1895
Discovery Credits Isolated in 1895 by Sir William Ramsay at London, UK, and independently by P. T. Cleve and N. A. Langlet at Uppsala, Sweden.
Remarks Colorless, odorless gas. Unreactive chemically. Used in deep-sea diving, weather balloons, and low temperature research instruments. Most natural sources of helium come from natural gas deposits where He is present from the alpha particle decay of heavy radioisotopes of U and Th and their daughter products.
References Emsley, J., 1991; THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p.
See Also WebElements,ChemiCool

Naturally Occurring Isotopes

Symbol Isotope Mass Isotope Nuclide Number Isotope Number Natural Abundance Half-life Half-life Units Decay Mode Decay Mode MeV Decay Mode %
He 3.01603 3 2 0.0001% Stable
He 4.0026 4 2 99.9999% Stable

There are no Minerals containing He (Helium) in the chemical formulae

Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period
1 1 H 2 He
2 3 Li 4 Be 5 B 6 C 7 N 8 O 9 F 10 Ne
3 11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar
4 19 K 20 Ca 21 Sc 22 Ti 23 V 24 Cr 25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn 31 Ga 32 Ge 33 As 34 Se 35 Br 36 Kr
5 37 Rb 38 Sr 39 Y 40 Zr 41 Nb 42 Mo 43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd 49 In 50 Sn 51 Sb 52 Te 53 I 54 Xe
6 55 Cs 56 Ba * 71 Lu 72 Hf 73 Ta 74 W 75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg 81 Tl 82 Pb 83 Bi 84 Po 85 At 86 Rn
7 87 Fr 88 Ra ** 103 Lr 104 Rf 105 Db 106 Sg 107 Bh 108 Hs 109 Mt 110 Ds
-
*Lanthanides * 57 La 58 Ce 59 Pr 60 Nd 61 Pm 62 Sm 63 Eu 64 Gd 65 Tb 66 Dy 67 Ho 68 Er 69 Tm 70 Yb
**Actinides ** 89 Ac 90 Th 91 Pa 92 U 93 Np 94 Pu 95 Am 96 Cm 97 Bk 98 Cf 99 Es 100 Fm 101 Md 102 No