25) How many total ions would be present when an ionic compound is formed between a

group 13 element and nitrate ions?

A) 2

B) 3

C) 4

D) 5

E) 6

4 ions

1 M³⁺ ion and 3 NO₃⁻ ions (Where M³⁺ stands for the group 13 cation).

Explanation:

Group 13 elements are Boron, Aluminium, Galium, Indium and Thalium. When they form ionic compounds they can lose their three valence electrons to form a tripositive (+3) ion. Nitrate ion is a negative ion with a single negative (-1) charge. When these two form a compound 3 univalent negative nitrate ions must combine with one tripositive group 13 element to form a neutral compound. So the total no of ions is 4.