Of the following equilibria, only will shift to the right in response to a decrease in volume. Of the following equilibria, only will shift to the right in response to a decrease in volume. H2 (g) + Cl2 (g) ↔ 2 HCl (g) 2 Fe2O3 (s) ↔ 4 Fe (s) + 3O2 (g) 2 SO3 (g) ↔ 2 SO2 (g) + O2 (g) N2 (g) + 3H2 (g) ↔ 2NH3 (g) 2HI (g) ↔ H2 (g) + I2 (g)

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