NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 34
Total: 49
34.Write the electronic configurations of the elements with the atomic numbers 61, 91, 101, and 109.
Solution:  
Z=61:4f56s2
Z=91:5f26d17s2
Z=101:5f137s2
Z=109:6d77s2
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