6. How many valence electrons are in the atoms with electron configuration: 1s²2s²2p⁶3s²3p⁶4s²3d⁵?
A. 2
B. 5
C. 7
D. 13
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6. How many valence electrons are in the atoms with electron configuration: 1s²2s²2p⁶3s²3p⁶4s²3d⁵?
A. 2
B. 5
C. 7
D. 13
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