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