Why does bromine have 7 valence electrons?

Finest Reply

The component bromine has 35 protons in its nucleus, and due to this fact
in its electrically impartial state it additionally has 35 electrons. Two
electrons match within the innermost shell, eight match within the subsequent shell,
eighteen match within the subsequent shell, which takes the whole as much as 28. If
we subtract 28 from 35 we get seven, voila.

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