Question

part b
indicate the number of unpaired electrons in br.
express your answer as an integer.
unpaired electron(s)
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Explanation:

Step1: Determine electron configuration of Br

Bromine (Br) has an atomic number of 35. Its electron configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^5$.

Step2: Analyze the 4p orbital

The 4p subshell can hold a maximum of 6 electrons. In Br, the 4p orbital has 5 electrons. Using Hund's rule, electrons fill orbitals singly first. So, in the 4p subshell, 3 orbitals are present. 5 electrons will fill 3 orbitals with one unpaired electron (since 3 orbitals have 2 electrons each (total 6) but we have 5, so one orbital has 1 unpaired electron).

Answer:

1