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तत्वों B,P, S तथा F की प्रथम आयनन एन्थेलपी के बढ़ने का (सबसे कम वाला सर्वप्रथम ) सही क्रम है -
A. F < S < P < B
B. P < S < B < F
C. B < P < S < F
D. B < S < P < F

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Correct Answer - D
दिये गये तत्वों के बाह्म इलेक्ट्रॉनिक विन्यास निम्न है -
`B: 2s^2 2p^1, P : 3s^2 3p^3, S : 3s^2 3p^4, F: 2s^2 2p^5`
अतः क्रम निम्नलिखित होना चाहिए -
`B lt S lt P lt F`
फ्लोरिन के सर्वाधिक विधुत ऋणात्मक होने के कारण इसकी आयनन एन्थेलपी उच्चतम होती है ।

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