Write the electronic configuration of the following:

Cl, Cr, Nb

1. Chlorine (Cl):  
   Atomic number = 17  
   Electronic configuration = \( 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^5 ___ _________ ________ _________ _________ _________.
________ _______ ________ _____ _____ ____.
__________ _______ ________ _____ _______ ___ ______ ____ ________ ______.
______ ________ _________ ___ _____.
___ ___ ______ ______ _______ ________ _____ _______ ________ __________ _____.
_________ _________ ______ _________ ________ _________ ___ ________ ___ _____ ______ ________.
____ ___ ________ ______ ___ _________ __________.
___ __________ __________ ____ ________ ______ _______ ______ ______ ______ ____.
______ ____ ____ __________ __________ ___ __________ _________ ________.
___ _____ ________ _____ _____ ________ _______ _____ ____.
___ ________ ____ ____ ____ __________.
_________ __________ ________ ___ _____ ___ _____ ___.
__________ ____ ____ _______ _____ ____ ______ ________.
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