Electronic configuration of potassium (K) and bromine (Br):
Potassium (K) has an atomic number of 19, so its electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$. Bromine (Br) has an atomic number of 35, so its electronic configuration is $1s^2 2s^2 2p^6
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