equation Fe3O4=Fe+CO2 is an impossible reaction
Answer:
Argon {Ar}
Explanation:
The noble gas used for a condensed electron configuration is the one before the element which you are configuring.
In this case, the element (Mn) is manganese
The noble gas that is before this element is Argon which is the row above it
so your configuration would be {Ar} 3d^5 4s^2
It has to be A or B bc c and d are just dumb answers
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I hope I helped :3