•Rules
for writing electron configuration:
•1. The no. of electrons in neutral atom = atomic no. (no. of protons)
•2. Fill the lowest energy sublevel completely, then the next lowest, etc.
•3. No more than two electrons can be placed in a single orbital. The electrons have opposite spins in the same orbital. (2 electrons in s, 6 in p, 10 in d, 14 in f)