How do you calculate the valency of an element

- How do you calculate the valency of an element from its electronic configuration
- How do you calculate the valency of an element from its electronic configuration class 10
- How to calculate the valency of elements
- How do you calculate the possible valency of an element
- How do we calculate the valency of an element
- How will you calculate the valency of an element give its electronic configuration
- How to calculate the valency of an element in a compound
- How can we calculate the valency of an element