posted by John on .
From which sublevel are the first 2 electrons for Fe removed from ______
From which sublevel is the next electron for Fe removed from _________
Why does the removal of electrons stop at this subleval and number of electron??
Please help me !!!
Fe is 1s2 2s2 2p6 3s2 3p6 3d6 4s2.
So the first 2 e come from the 4s level. The next 6 (one at a time) would come from the next lower level. which one is that?
It stops at 3 because the configuration then is
1s2 2s2 2p6 3s2 3p6 3d5. One reason is that the 3d level at half filled is stable. A second reason is that with a +3 ion, it is almost impossible to pull another electron off and overcome the attractive forces between that last electron and the +3 charge of the nucleus.