Which of the following ions do not have the electronic configuration of an argon atom?
a) Ca+2
b) S-2
c) K+
d) O-2
Which one of the groups below contains only ionic compounds?
a) Calcium Oxide, Hydrogen Chloride, Magnesium Oxide
b) Calcium Oxide, Magnesium Oxide, Sodium Chloride
c) Carbon Dioxide, Copper Sulphate, Hydrogen Chloride
d) Copper Sulpahte, Methane, sodium Chlorid
