Indicate which of the given electronic configurations are...

Indicate which of the given electronic configurations are true ground state configurations for the respective atoms and which are false. (Take care! There are some exceptions to the simple rules.) true false Si --> 1s^22s^22p^63d^23s^2 true false Cr --> [Ar]3d^44s^2 true false Hg --> [Xe]4f^145d^106s^2 true false Sc --> [Ar]4s^13d^2 true false Au --> [Xe]4f^145d^106s^1

Transcript

00:01 So we have to write the correct round electronic configuration for the following elements.

00:11 And first of them is silicon.

00:15 Silicon has atomic number 14.

00:18 So following the off -bow principle, 1s2, 2 .2, 2p6, 3s2, 3p2, 3p2.

00:32 So this will be the correct ground state electronic configuration because following the off -go principle the next electron will enter in the p sub -shell not in the d sub -shell once the piece of shell is filled it means once thus all the six electrons are being filled in piece of shell then it will enter into the d sub -shell so the ground electronic configuration that is what we have been given 1 s 2 2 s 2 2p 6 3 s 2 3d 2 so is incorrect and it's false as it do not follow of bore principle so this is the a part, now b part.

02:25 We have chromium.

02:29 Chromium has atomic number 24.

02:35 So now the electronic configuration will be argon.

02:41 So this is argon 18 and now we have left with six electrons.

02:49 So this will be 3d 4 .4 s2.

02:58 Now there is a exception and the exception is this is the electronic configuration we have been given here right but since half filled d orbital are more stable that is d5 hence correct electronic or we say ground ground state electronic configuration ground state electronic configuration is argon 3d 5 4 s 2 so this will be the correct electronic configuration hence the given ground state electronic electronic configuration is false.

05:20 Now moving to c part...

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