Observe the IP1, IP2, IP3, and IP4, respectively for the element A,B,C and D. Identify which element have 3e− in outermost shell. (all values are in kJ/ mole)
A
786, 1577, 3231, 4355
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B
737, 1450, 7732, 10540
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C
495, 4562, 6912, 9544
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D
800, 2427, 3659, 25025
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Solution
The correct option is D 800, 2427, 3659, 25025 Since, after extracting third electron from valence shell, the configuration becomes as of nobel gas requiring very very high 4th ionisation energy which is in case of (D).