Định lượng photpho trong mau phan bon, cân 1g mẫu và tạo tủa dưới dang Mg NH4PO4.Nung tủa ở 600°c được dạng cân Mg2p2o7 co khoi luong 0,2350g tính %P

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Perimeter? wheres the answers

Of course: ) what’s your name ?