Chemistry, asked by cheni38131, 9 days ago

Why is 3d in the 4th period?

Answers

Answered by lakshmisivani09

Answer:

As you can see, the 4S orbital is filled BEFORE the 3D orbital as it has a lower energy, and therefore 3D has to be placed in the 4th row in the periodic table, after 4S. This trend continues as you go down the rows.

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