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Which element has the highest first ionization energy?

$ (a)\;Sodium \\(b)\;Aluminium \\ (c)\;Calcium \\ (d)\;phosphorus $

1 Answer

Phosphorus (P) has a first ionization energy of $1012 kJ/mol.$
Hence d is the correct answer.
answered Mar 14, 2014 by meena.p
 

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