15. In the electron configuration [Ar] 4s²3d¹º4p⁴, which are valence electrons?
(A) All of the electrons after the [Ar]
(B) Only the 4s² electrons
(C) Only the 3d¹º electrons
(D) Only the 4p⁴ electrons

(E) Both the 4s² and the 4p⁴ electrons

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