Question
Bromine has the highest negative electron gain enthalpy as compared to other elements of 4th period. Explain.
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Answer
- As compared to other elements (K to Kr) of 4th period, bromine (Br) has the lowest atomic size.
- It has electronic configuration, $35 Br [ Ar ]^{18} 3 d^{10} 4 s^2 4 p^5$.
- It has seven valence electrons and it needs one electron to complete octet.
- Hence Br has the strongest tendency to gain an electron and energy released is maximum in the period. $Br _{( g )}+ e ^{-} \rightarrow Br _{( g )} \Delta_{ eg } H =-325 kJ mol ^{-1}$
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