Answer:
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
Answer:
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
