Which of the following is not characteristic of a centrally planned economy

answer: in 1842 mosander also separated the yttria into three oxides: pure yttria, terbia and erbia (all the names are derived from the town name "ytterby"). the earth giving pink salts he called terbium; the one that yielded yellow peroxide he called erbium.

so in 1842 the number of known rare-earth elements had reached six: yttrium, cerium, lanthanum, didymium, erbium and terbium.

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explanation:

answer; (cognitive   dissonance);