How to determine amount of valence electrons in an element

- How do you determine the amount of valence electrons in an element
- How can you determine the amount of valence electrons an element has
- How do you determine the amount of valence electrons an element has
- How do we determine the amount of valence electrons an element has
- Know how to determine the number of valence electrons in an element
- How to determine number of valence electrons
- How to find number of valence electrons from electron configuration