The elemental symbol that would be placed in the bracket to write the electron configuration of bromine atom is [Ar]
From the question
We are to determine the elemental symbol of the noble gas that could be used for the abbreviation of the electronic configuration of bromine atom.
First we will write the electronic configuration of the bromine atom without abbreviating
The electronic configuration of bromine atom is
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵
Usually, the noble that is used for the abbreviation of the electronic configuration of an element is the noble gas that occurs just before the element.
In the periodic table, the noble gas that occurs before Bromine is Argon [Ar].
(Check the image attached below)
Hence, the elemental symbol that would be placed in the bracket to write the electron configuration of bromine atom is [Ar]
The abbreviated electronic configuration would be
[Ar] 3d¹⁰ 4s² 4p⁵
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