Posted by Lily on Saturday, October 20, 2012 at 8:46pm.
19K is 1s2 2s2 2p6 3s2 3p6 4s1
K can lose the 1 4s1 easily but the next shell is a closed shell.
Sc^3+ has no unpaired electrons. Ti^3+ has an unpaired electron. Here is the electron configuration.
21Sc is 1s2 2s2 2p6 3s2 3p6 3d1 4s2. Note that the +3 ion is formed by removing the 4s2 electrons and the 1 3d1.
22Ti is 1s2 2s2 2p6 3s2 3p6 3d2 4s2.
Note that the +3 ion is formed by removing the 4s2 electrons and ONE of the 3d2 electrons. That leaves an unpaired electron.
c.
20Ca 1s2 2s2 2p6 3s2 3p6 4s2
So Ca^2+ is formed by removing the 4s2 electrons. The next shell down is a closed shell.
Look at the Ti^2+ ion and where it can go (compare with the Ti^3+ above).
thank you!
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