a. | Primary valencies are satisfied by negative ions while secondary valencies are satisfied by negative ion only. |
b. | A metal ion has a definite number of secondary valencies around the central atom. |
c. | Primary valencies are usually ionizable, while secondary valencies are non-ionizable |
Choose the correct option:
1. | a and b | 2. | a and c |
3. | b and c | 4. | a, b and c |