Answer:
see attachment
Step-by-step explanation:
The maximum number of electrons in any shell is given by formula 2n² , where n is the number of shell .So in first shell , 2(1)² = 2 electrons would be accommodated.
Similarly in second shell , 2(2)² = 8 electrons would be accommodated .
Similarly we can find out the maximum number of electrons in 3rd , 4th and 5th shell .
The maximum number of electrons in valance shell is 8 .
Also, atomic numbers of ,
- Helium = 2
- Carbon = 6
- Neon = 10
- Sodium = 11
- Aluminium = 13
- Chlorine = 17
and we are done!