SELECT * FROM question_mgmt as q WHERE id=2122 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=63 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th chemistry The d-and f-Block Elements write the electronic configurations of the element

Question:

Write the electronic configurations of the elements with the atomic numbers 61, 91, 101, and 109.

Answer:

Atomic number Electronic configuration
61

[Xe]54 4f5 5d0 6s2
91

[Rn]86 5f2 6d1 7s2
101 [Rn]86 5f13 5d0 7s2
109 [Rn]86 5f14 6d7 7s2

 


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