Which of the following transitions are NOT allowed in the normal electronic emission spectrum of an atom?
ایٹم کے عام الیکٹرانک اخراج اسپیکٹرم میں مندرجہ ذیل میں سے کون سے ٹرانزیشن کی اجازت نہیں ہے؟
Answer: 2s → 1s
Explanation
In electronic transitions, a direct transition from 2s to 1s is forbidden.
Due to quantum mechanical selection rules.
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