Recall that for a neutral element, Atomic number = # of protons = # of electrons.
The atomic number of Br is 35 and since it’s a neutral element, this means Br has 35 electrons.
Show the orbital-filling diagram for Br (bromine). Stack the subshells in order of energy, with the lowest-energy subshell at the bottom and the highest-energy subshell at the top
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What scientific concept do you need to know in order to solve this problem?
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