When electrons are filling energy levels, the lowest energy sublevels are occupied first. This is
A. None of these
B. The Aufbau principle
C. Hund's rule
D. Conservation of energy
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Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)