What concentration of the lead ion, Pb2+Pb2+, must be exceeded to precipitate PbCl2PbCl2 from a solution that is 1.00×10−21.00×10−2 MM in the chloride ion, Cl−Cl−? KspKspK_sp for lead(II) chloride is 1.17×10−51.17×10−5 .

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

answer7,570,82356 cubic centimeters;

im doing test rn im going with 2 but ill give answer if itss wrong,   : )