Question

which rule is violated in electronic configuration 1s2, 2s2,3s2,2p6

Answer 1

It helps to predict the values of all the four quantum number of any electron. 3) Which rule is violated in the electronic configuration? 1S0 2S2 2P4. Ans: Aufbau principle is violated in this electronic configuration because according to Aufbau principle, Electron enters into orbital of lower energy.

Answer 2

Answer:The numerical value of the principle quantum number n for 2s and 2p is the same; however, they don't have a particular value of the azimuthal quantum number l. For 2s, l=0, and for 2p, l=1, so 2s and 2p are not degenerate. So none of the three principles or rules whether Aufbau's, n+l or Hund's is violated in this electronic configuration.

However, my friend says that there is a violation of the Hund's Rule in this electronic configuration, and according to him the right configuration is: 1s2 2s1 2p1x 2p1y 2p0z, which in turn violates the Aufbau Principle, because the orbitals of lower energy level have to filled first completely and 2s<2p.

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