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ArkGoLucky

  • 2 years ago

Why did "d" orbitals start at "3d" instead of "4d"?

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  1. moongazer
    • 2 years ago
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    I think it is because of their energy level

  2. ArkGoLucky
    • 2 years ago
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    I mean before 3d is 4s so why not 4d?

  3. shubham.bagrecha
    • 2 years ago
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    electrons are filled in increasing order of energies, in accordance to the aufbau principle. According to it the filling of electron is governed by "n+l" rule and "n" rule. for 3d orbital, n+l = 3+2 = 5 for 4s orbital, n+l = 4+0 = 4 since the n+l value of 4s is less than that of 3d , 4s is filled first. See the atttachment for order of filling electrons.

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