Cr 2+ ion electron configuration?
What is the electron configuration of Cr2+ (Chromium 2+) ion?
Answer:
Deborah,
The inner electrons will just be an Ar core, which is 1s2 2s2 2p6 3s2 3p6. So we really only need to worry about the valence electrons:
Cr is in column 6 of the periodic table, but since this is a 2+ ion we're talking about, there are 2 missing, so there are a total of 4 valence electrons. We have the 4s subshell and the 3d subshell to place electrons in, but the general rule is that if a transition metal ion is missing 2 or more electrons from its neutral state, you need to take these first two electrons from the 4s subshell since it is the outermost subshell of the atom.
Thus, the ground state electron configuration for a Cr2+ ion is [Ar]3d4.
the same as cr but with 2 less e-
sorry i cant write it out i took chem 2 yrs ago and forgot
1s2, 2s2, 2p6, 3s2, 3p6, 3d4
the Cr+2 ion gets rid of its 4s electrons to ionize.
Cr electron shells = K2, L8, M13, N1
Cr 2+ ion = K2, L8, M12
Chromium is one of those exceptions where you get rid of the highest energy level number first.
So instead of writing Cr as:
[Ar] 4s2 3d4
Cr is : [Ar] 4s1 3d5
But since it's Cr2+ then you would have to get rid of two electrons (do this with the highest energy level number first, then energy level(s p d f) )
Cr2+ : [Ar] 3d4
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Answer:
Deborah,
The inner electrons will just be an Ar core, which is 1s2 2s2 2p6 3s2 3p6. So we really only need to worry about the valence electrons:
Cr is in column 6 of the periodic table, but since this is a 2+ ion we're talking about, there are 2 missing, so there are a total of 4 valence electrons. We have the 4s subshell and the 3d subshell to place electrons in, but the general rule is that if a transition metal ion is missing 2 or more electrons from its neutral state, you need to take these first two electrons from the 4s subshell since it is the outermost subshell of the atom.
Thus, the ground state electron configuration for a Cr2+ ion is [Ar]3d4.
the same as cr but with 2 less e-
sorry i cant write it out i took chem 2 yrs ago and forgot
1s2, 2s2, 2p6, 3s2, 3p6, 3d4
the Cr+2 ion gets rid of its 4s electrons to ionize.
Cr electron shells = K2, L8, M13, N1
Cr 2+ ion = K2, L8, M12
Chromium is one of those exceptions where you get rid of the highest energy level number first.
So instead of writing Cr as:
[Ar] 4s2 3d4
Cr is : [Ar] 4s1 3d5
But since it's Cr2+ then you would have to get rid of two electrons (do this with the highest energy level number first, then energy level(s p d f) )
Cr2+ : [Ar] 3d4
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