The electron affinities of boron and aluminum are -27 and -42 kj/mol, respectively. Contrary to the usual periodic trends, the electron affinities of remaining elements in group 13 are between those of B and Al. How do you explain this apparent anomaly?

The electron affinities of boron and aluminum are -27 and -42 kj/mol,

1.	The electron affinities of boron and aluminum are -27 and -42 kj/mol, respectively. Contrary to the usual periodic trends, the electron affinities of remaining elements in group 13 are between those of B and Al. How do you explain this apparent anomaly?
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