Aufbau Principle Indicate which of the given electronic...

Aufbau Principle 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.) As -> [Ar]3d104s24p3 Cr -> [Ar]3d44s2 Cu -> [Ar]3d94s2 Si -> 1s22s22p63s23p2 Sc -> [Ar]3d14s2

Transcript

00:01 So first part is arsenic.

00:05 Arsenic has atomic number 33.

00:09 So now argon, so that represents the 18 electrons, up to 18 electrons, and then the rest of the electrons will be filled like 3d10, 4s2, 4p3.

00:36 So hence, this electronic configuration is, is true.

00:43 Then second part.

00:46 We have chromium.

00:51 Atomic number for chromium is 24.

00:54 For chromium also up to 18 electrons we will represent the organ noble gas and then rest of the electrons are filled like 3d 4 4 s 2.

01:14 So this should be the correct electronic configuration but here is an exception and the exception is that the subshells are tend to be stable the electronic configuration tend to be stable when the subshells are fully filled or half filled okay so now for stable electronic configuration this 3d subshell so it tends to be be half filled okay and now that one electronic removed from this as a shell right okay so this will be the electronic configuration the stable electronic configuration so this is the stable electronic configuration so now this is false then we have heard part that is copper copper has atomic number 29 up to 18 electrons will be represented by argon noble gas and then rest of the electrons are filled in 3d sub shell 3d9 4 s 2 but here also as i said that for a stable electronic configuration the subshells tend to be fill half filled or fully filled okay so here also it can lead to form electronic configuration like this.

03:23 So this is the stable electronic configuration...

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