How to calculate the number of electrons in a shell

- How to calculate the maximum number of electrons in a shell
- How to calculate the number of electrons in each shell
- How to calculate the number of electrons in valence shell
- How to calculate the number of electrons in the outer shell
- Formula to calculate the number of electrons in a shell
- How to calculate no of electrons in a shell
- How to find the number of valence electrons
- How to find number of valence electrons from electron configuration
- How to determine number of valence electrons