The species which has its fifth ionisation potential equal to 340 V is :

B^{+}

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C^{+}

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Solution

The correct option is B B
Boron has 5 atomic no. with config ${1 s}^{2} {2 s}^{2} {2 p}^{1}$ .
$E = 13.6 e V / n^{2} E = 340 V n = 2$

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