Roman numeral 10000 CC DD.svg

Helium

E Vicipaedia
Salire ad: navigationem, quaerere
2 hydrogeniumheliumlithium
nullum

He

neon
He-TableImage.svg
Proprietates generales
Nomen, Symbolus, Numerus Atomicus helium, He, 2
Grex, Periodus, Glaeba 18, 1, s
Color
transparens
Pondus atomicum 4,002602(2)  g·mol−1
e- per sphaeram 2
Proprietates physicae
Status Gas
Punctum liquefactionis 0,95 K (26 atm)
Punctum fervoris 4,22 K
(-268,93 °C, -452,07 °F)
Punctum triplex Nullum
Punctum criticum 5,19 K, 0,227 MPa
Calor latens fusionis 0,0138 kJ·mol−1
Capacitas caloris (25 °C) 20,786 J·mol−1·K−1
Proprietates atomicae
Structura crystallina Hexagona
Affectus oxidationis 0
Radius covalentiae 28  pm
Radius Van der Waals 140 pm
Varietas
Conductus caloris (25 °C) 0,1513  W/m/K
Velocitas soni (25 °C) 972 m/s

Helium,[1] He abbreviatione, est elementum chemicum. Maxima cryogenica elementis omnibus est, et propter energia puncti zerois gas puncto triplice caret, solidificatio sua super pressionem atmosphaericam quaeret.

Notae[recensere | fontem recensere]

  1. "Helium": Peter van der Krogt, "Elementa chemica" apud situm Elementymology & Elements Multidict

Nexus externi[recensere | fontem recensere]

Elementa chemica: series paginarum brevium
Ptable-MainPage.png
1 H 2 He 3 Li 4 Be 5 B 6 C 7 N 8 O 9 F 10 Ne 11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar 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 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 55 Cs 56 Ba 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 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 87 Fr 88 Ra 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 103 Lr 104 Rf 105 Db 106 Sg 107 Bh 108 Hs 109 Mt 110 Ds 111 Rg 112 Cn 113 Uut 114 Fl 115 Uup 116 Lv 117 Uus 118 Uuo