Question

write electronic configration of Cr,cu,Zn​

Answer 1

Since chromium had 4 electrons, which is one short of 5 electrons to get just hslf-filled. ... To attain a completely filled electronic configuration copper gains one electron from the d-orbital and attains the electronic configuration of (Ar) d10 4s1. Thus both Cr and Cu have exceptional electronic configuration.

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Answer 2

cr=2,8,8,2

cu=2,8,18,1

zn=2,8,18,2...