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The first ionization energy of an element is 736 kJ per mole of atoms. An atom of this element in the ground state has a total of how many valence electrons?

$ (a)\;1 \\(b)\;2 \\(c)\;3 \\ (d)\;4 $
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$ 736 kJ/mol$ is the value for Mg.
Use the Periodic Table to find Mg.
It has 2 valence electrons.
Hence b is the correct answer.
answered Mar 15, 2014 by meena.p

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