Nickel has an atomic mass of 58.69, and cobalt has an atomic mass of 58.93. despite
this, mendeleev listed cobalt before nickel in his periodic table. what information
caused mendeleev to order the elements in this way?

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)