An element has the electron configuration of
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1s 2s 2p 3s 3p 3d¹04s²4p 4d¹4f5s25p65d¹6s². In this ele
ment's photoelectron spectroscopy emission spectrum, the
peak that represents which subshell would have the smallest
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height?
(A) 1s
(B) 4f
(C) 5d
(D) 6s