Helium
Helium, He abbreviatione, est elementum chemicum.
Maxima cryogenica elementis omnibus est, et propter energia puncti zerois gas nobile puncto triplice caret, solidificatio sua super pressionem atmosphaericam quaeret. Et liquidum Helii isotopi sub zero absoluto pro superfluditate usum est.
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| Proprietates generales | ||||||
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| Nomen, Symbolus, Numerus Atomicus | helium, He, 2 | |||||
| Grex, Periodus, Glaeba | 18, 1, s | |||||
| Color |  | |||||
| 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 | |||||
Notae
Nexus externi
- Hoc elementum apud Patreon: periodic videos
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| 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 Nh 114 Fl 115 Mc 116 Lv 117 Ts 118 Og | |
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