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16 April, 05:06

Two elements in the second transition series (Y through

Cd) have four unpaired electrons in their 3 + ions. What elements

fitthis description?

+5
Answers (2)
  1. 16 April, 05:26
    0
    Technetium and Rhodium

    Explanation:

    For Technetium, Symbol: Tc

    Atomic number: 43

    Electron configuration: [Kr] 4d55s2

    Atomic mass: 98 u

    For Rhodium, Symbol: Rh

    Electron configuration: [Kr] 4d85s1

    Atomic number: 45

    Atomic mass: 102.9055 u
  2. 16 April, 05:29
    0
    Technetium (Tc) and Rhodium (Rh)

    Explanation:

    The two elements in the second transition series (Y through Cd) that have four unpaired electrons in their 3⁺ ions are

    Tc [Kr] 4d⁵5s² after losing 3 electron becomes Tc [Kr] 4d⁴ and

    Rh [Kr] 4d⁸ 5s¹ after losing 3 electron becomes Rh [Kr] 4d⁶ where Kr is the electronic configuration of Krypton (a noble gas)

    so both Technetium (Tc) and Rhodium (Rh) have four unpaired electrons
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