A 1.00 L solution contains 4.00×10-4 M Cu(NO3)2 and 3.000×10-3 M ethylenediamine (en). The Kf for Cu(en)2^2+ is 1.00×10^20. What is the concentration of Cu2+(aq ) in the solution?

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false