Explain why the 4s sublevel fills before the 3d begins to fill as electrons are added.

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Dana Herzog · Accepted Answer

The energy of the 4-s subshell is lower than the energy of 3-d subshell.Explanation:During the filling of electrons in subshells, the lower energy levels are filled before the higher energy levels. Also known as Aufbau principle.Energy of the sublevel = (n + l) where : n = Principal quantum number              l = Azimuthal quantum number(s=0,p=1,d=2,f=3)Energy of 4-s subshell= (4+0) = 4Energy of 3-d subshell=(3+2) = 5Energy of 4-s subshell is lower than the energy of 3-d subshell, that is why 4s orbital is filled before the 3-d subshell.

Dana Herzog · Answer

Hey there!Explain why the 4s sublevel fills before the 3d begins to fill as electrons are added.Electrons occupy orbitals in a definite sequence, filling orbitals with lower energies first. Generally, orbitals in a lower energy level have lower energies than those in a higher energy level. But, in the third level the energy ranges of the principal energy levels begin to overlap. As a result, the 4s sublevel is lower in energy than the 3d sublevel, so it fills first.Hope this helpsTobey

Dana Herzog · Answer

quartzexplanation:

Dana Herzog · Answer

i think it's c. i'm not sure but i think so.

Dr. Katlynn Swaniawski II

Explain why the 4s sublevel fills before the 3d begins to fill as electrons are added.

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