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एक तत्व के लिए विभिन्न आयनन एन्थैल्पी (kJ `mol^(-1)` में) निम्न प्रकार है:
`{:("I.E.","Ist","IInd","IIIrd","IVth","Vth"),(,577.5,1810,2750,"11,580","14,820"):}` तत्व है:
A. P
B. Mg
C. Si
D. Al

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Correct Answer - D
IIIrd तथा IVth आयनन एन्थैल्पी के बीच बहुत ज्यादा अन्तर है, अतः तत्व में त्रिसंयोजी इलेक्ट्रॉन है।

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