Electrons enter the 4s sub-level before the 3d sub-level because...
Athere is only one 4s orbital
Bthe 4s orbital is spherical
Cthe 4s orbital has a lower energy
Dthe 3d orbitals have a lower energy
Athere is only one 4s orbital
Bthe 4s orbital is spherical
Cthe 4s orbital has a lower energy
Dthe 3d orbitals have a lower energy
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