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Question:

Which noble gas has the same electron configuration as the anion in the compound aluminum bromide?

a.) Krb.) Rnc.) Hed.) Ne

Answer:

The answer is a) KryptonThe bromide anion exists as Br-With the single negative charge, you know that it has an extra electron, therefore it's electron config is like the noble gas nearest to it on the periodic table: krypton.

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