Nodyn:Infobox lithium

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heliumlithiumberyllium
H

Li

Na
Ymddangosiad
arian golau (Fe'i gwelir yma'n arnofio mewn olew)


Llinellau sbectral lithiwm
Nodweddion cyffredinol
Enw, symbol, rhif lithium, Li, 3
Ynganiad

/ˈlɪθiəm / LI-thee-əm

Teulu'r elfennau Metel alcalïaidd
Grŵp, cyfnod, bloc 12, s
Rhif atomig 6.941(2)
Patrwm yr Electronnau 1s2 2s1 or [He]2s1
Electronnau / cragen 2, 1 (Image)
Nodweddion ffisegol
Stâd solid
Dwysedd (oddeutu tymheredd yr ystafell) 0.534 g·cm−3
Dwysedd hylif / Ymdoddbwynt 0.512 g·cm−3
Ymdoddbwynt 453.69 K, 180.54 °C, 356.97 °F
Berwbwynt 1615 K, 1342 °C, 2448 °F
Pwynt critigol (extrapolated)
3223 K, 67 MPa
Enthalpi ymdoddiad

Gwres o ymdoddi

{{{heat fusion 2}}} kJ·mol−1
Enthalpi anweddiad


Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 797 885 995 1144 1337 1610
Nodweddion Atomig
cyflwr ocsidiad +1, -1
(strongly basic oxide)
Electronegativity 0.98 (Graddfa Pauling)
Ionization energies 1st: 520.2 kJ·mol−1
2: 7298.1 kJ·mol−1
3ydd: 11815.0 kJ·mol−1
Radiws atomig 152 pm
Radiws cofalent 128±7 pm
Radiws Van der Waals 182 pm
Amrywiol
Strwythyr y crisal body-centered cubic
Magnetic ordering paramagnetic
Gwrthedd trydanol (20 °C) 92.8 nΩ·m
Dargludiad Thermal 84.8 W·m−1·K−1
Ehangiad thermal (25 °C) 46 µm·m−1·K−1
Cyflymder sain (20 °C) 6000 m·s−1
Modwlws Young 4.9 GPa
Modwlws Shear 4.2 GPa
Modwlws Bulk 11 GPa
Graddfa caledwch Mohs 0.6
CAS registry number 7439-93-2
Most stable isotopes
Main article: Isotopes of lithium
iso NA half-life DM DE (MeV) DP
6Li 7.5% 6Li is stable with 3 neutrons
7Li 92.5% 7Li is stable with 4 neutrons
6Li content may be as low as 3.75% in
natural samples. 7Li would therefore
have a content of up to 96.25%.
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