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yawa3891 [41]
3 years ago
9

Two elements in the second transition series (Y through

Chemistry
2 answers:
ziro4ka [17]3 years ago
4 0

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

alukav5142 [94]3 years ago
4 0

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

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