Table 1.

Comparison of Li and Na.

	Li	Na
Ionic radius	0.76 Å	1.02 Å
Content in the earth's crust/Reserve	0.0065%/1350W t	2.4%/500,000 W t
Cost of trona (per ton)	$5,000	$135–165
Weight	7 g mol−1	23 g mol−1
Standard electrode potential (vs. SHE)	−3.02 V	−2.71 V