ORbital:- u cn just make it clear that by understanding that they r the sub-shell of energy level.
for eg.
shell one contains oribtal - 1s(2e-) (grand Total 2e-)
shell two contains orbital - 2s (2e-), 2p(2*3 e-(px,py,pz) (grand total 8e=(2e-+6e-)
shell three contains ornital - 3s(2e-), 3p(2*3e-), 4s(2e-), 3d(2*5e-) (element in which electrons are filled in 3d would be transition metal) [grand total 20e-)
soory!
my explain skill is very poor