https://doubtnut.com/question-answer-chemistry/first-second-and-third-ip-values-are-10ev15ev-and-150ev-element-can-be-23546441 for 28 check this video solution shib😊
28) - C. here according to data different between 2nd and 3rd IP is high as compared to 1st IP. it means after removing 2nd electron there must be stable configuration obtained.
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