What are the symbol formulae of barium oxide, rubidium nitride, and magnesium chloride?

1 Answer
Sep 24, 2016

Answer:

Consider the position of each metal ion on the Periodic Table. An ionic compound requires that the charge of each ion sums to neutral.

Explanation:

And then consider the position of the gegenion, to get the charge of the non-metal.

#A.# #"Barium and oxygen"#; barium is in Group 2, and tends to form #Ba^(2+)# ions. Oxygen is in Group 16, and tends to form #O^(2-)# ions as its oxide. #BaO# is the likely formula.

#B.# #"Rubidium and nitrogen"#; barium is in Group 1, and exclusively forms #Rb^(+)# ions. Nitrogen is in Group 15, and tends to form #N^(3-)# ions as its nitride. #Rb_3N# is the likely formula.

#C.# #"Magnesium and chlorine"#; magnesium is in Group 2, and tends to form......... Chlorine is in Group 17.............You tell me the formula?