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10 March, 09:50

Ion charge for pdtwo elements in the second transition series (y through cd) have four unpaired electrons in their 3 + ions. what elements fit this description

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  1. 10 March, 10:05
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    Answer is: Technetium (chemical element with symbol Tc and atomic number 43) and rhodium (symbol Rh and atomic number 45).

    1) Electron configuration of technetium:

    ₄₃Tc 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d⁵5s².

    In 3 + ion three valence electrons are removed:

    ₄₃Tc³⁺ 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d⁴, four unpaired electrons are in 4d orbital.

    2) Electron configuration for rhodium:

    ₄₅Rh 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d⁸5s¹.

    In 3 + ion three valence electrons are removed:

    ₄₅Rh³⁺ 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d⁶, in 4d orbital four electrons are unpaired and two electrons are paired.
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