sir plz tell that in sixth period orbital filled in according to aufbau prin. i.e ilike (6s,4f,5d ,6p) but sir after filling 6s the next electron should enter in 4f but here next electron enter in 5d why
election can be filled according to n+l rupe
here n+l for 6s = 6, 4f = 7, 5d = 7
n+l values is lowest for 6s so electron will be filled in 6s then 4f and 5d.
for 4f and 5d have sam...