| http://www.w3.org/ns/prov#value | - Illustrative examples of low work function metals include alkaline metals such as lithium or sodium, Group 2A or alkaline earth metals such as beryllium, magnesium, calcium, or barium, and Group III metals including rare earth metals and the actinide group metals such as scandium, yttrium, lanthanum, cerium, europium, terbium, or actinium.
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