Question

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Write the symbols for the ions, and the correct formula for the ionic compounds formed by each of the following:

a) barium and iodine

b) gallium and selenium

c)sodium and nitrogen

d) cadmium and sulfur

Answer 1

                                      

	symbol for the cation	symbol for the anion	formula for the ionic compound
a) barium and iodine	Ba2+	I-
b) gallium and selenium	Ga2+	Se2-	GaSe
c)sodium and nitrogen	Na+	N3-
d) cadmium and sulfur	Cd2+	S2-	CdS

Note that Barium (Ba), Cadmium(Cd) , Gallium (Ga) for + 2 ions.

Sodium form Na+ ion.

Similarly, Iodine form I-, Se and S form 2- anion and Nitrogen forms N3-.

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