Question

how many valence electrons does bromine have?

Explanation:

Valence electrons are the electrons in the outermost shell of an atom. Bromine has an atomic number of 35. Its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}\). The outermost shell is the 4th shell (\(n = 4\)), and the number of electrons in this shell (\(4s^{2}4p^{5}\)) is \(2 + 5=7\).

Answer:

7