Electrons and Quantum Mechanics - Oakland Schools

Analysis and Conclusions answers
1. Record your observations below.
a. Test tube 1 ___pale green solution forms ____________
(the Fe 2+ forms when the acid oxidizes the metal)
b. Test tube 2 ____yellow solution forms______________________
(Fe 3+ dissociates in water)
2. Write the electron configuration for the iron metal.
_______1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 6 ____________________________________
3. Which two electrons are lost to form the pale green Fe 2+ ion?
_______________4s 2 ________________________________________________
4. Which additional electron is lost to form the yellow Fe 3+ ion?
_______________the paired 3d electron_____________________________
5. Other transition elements exhibit oxidation states from 2+ up to 8+. Why does
iron have only the 2+ and 3+ oxidation states?
______The empty 4s and half-filled 3d sublevel form stable ions.____
6. Would you predict iron to be more stable at the 2+ or 3+ oxidation states?
Explain your answer.
_____The 3+ state is more stable because it results in a half filled sublevel._
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