ત્રણ પ્રતિનિધિ તત્વોની પ્રથમ ત્રણ આયનશક્તિ ઊર્જા ($kJ/mol$ માં) નીચે આપેલ છે:
તત્વ
$IE_1$
$IE_2$
$IE_3$
$P$
$495.8$
$4562$
$6910$
$Q$
$737.7$
$1451$
$7733$
$R$
$577.5$
$1817$
$2745$
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Diffcult
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c $(c) \,R$ is $p-block$ element, because difference between $IE_2$ and $IE_3$ is not very high as compared to between $IE_1$ and $IE_2$; hence stable oxidation state of $R$ will be higher than $+2.$
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