If an electron is added to an atom, that electron will be a select the correct answer below:
a. core electron
b. shielding electron
c. valence electron
d. none of the above

I think it s none of above if we add an electron to an atom it becomes a negative ion. Lets say we have atom A And B like for example A is more electronegative it wants more electrons it pulls one from B so one electron is added and i believe it s called elctrovalency.

(core electron are the non participating electrons from the last shell b also non part electrns valence are the ones who are used to make bonds )

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It has to be b i hope this