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The first IE (Kj mol^(-1))of group 13 el...

The first IE `(Kj mol^(-1))`of group 13 elements are
`B/801 Al/577 Ga/579 In/558 Tl/589`
How would you explain the deviation from general trend ?

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V PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-QUESTION BANK
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