Question

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A neutral atom with 4 electrons shells and 7 valence electrons must be



Bromine


Iodine


Manganese


Chlorine

Answer 1

Bromine

Step-by-step explanation:

We know that all halogens have seven valence electrons. So form given options bromine , iodine and chlorine could be the given atom but it should be the one which have 4 electronic shells. It will confirm from electronic configuration.

Electronic configuration of Br:

Br₃₅ = [Ar] 4s² 3d¹⁰ 4p⁵

Bromine have 4 electronic shell.

Electronic configuration of Iodine:

I₅₃ = [Kr] 4d¹⁰ 5s² 5p⁵

Iodine have 5 electronic shells.

Electronic configuration of Chlorine:

Cl₁₇ = [Ne] 3s² 3p⁵

Thus correct option is bromine.