Nodyn:Infobox lithium

helium ← lithium → beryllium H ↑ Li ↓ Na 3Li Y Tabl Cyfnodol
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	1, 2, 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%.