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Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom . Calculate the ionisation energy of sodium in kJ `mol^(-1)`.

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Ionization Energy in brief is the minimum amount of energy needed to knock off the valence electron of an atom to infinity
`E = (hc)/(lamda) = (6.626 xx 10^(-34) xx 3 xx 10^(8))/(242 xx 10^(-9)) = 8.21 xx 10^(-19)J//"atmon"`
For mole, `E = (8.21 xx 10^(-19)J//"atom") xx (6.022 xx 10^(23)"atom/mol")` = 494406.2J/mole = 494.4 kJ `"mole"^(-1)`
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