13th group or boron group
Question
Which of the following is least electronegative element?
Moderate
Solution
In boron family, electronegativity first decreases from B to Al and then it starts to increase on account of fully filled penultimate d and antepenultimate f subshell.
| Element | Electronegativity on Pauling scale |
| B | 2 |
| Al | 1.5 |
| Ga | 1.6 |
| In | 1.7 |
| Tl | 1.8 |
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