explain anamolous behaviour of copper and chromium
Answers
Answer:
Some elements do not follow the Aufbau principle, there are some alternate ways that electrons can arrange themselves that give these elements better stability.
Explanation:
Using the Aufbau principle, you would write the following electron configurations
Cr = [Ar]
4
s
2
3
d
4
Cu = [Ar]
4
s
2
3
d
9
The actual electron configurations are:
Cr = [Ar]
4
s
1
3
d
5
Cu = [Ar]
4
s
1
3
d
10
To understand why this occurs, it is important to realize that...
1. Completely filled sublevels are more stable than partially filled sublevels.
2. A sublevel which is exactly half filled is more stable than a partially filled sublevel which is not half full.
3. Electrons are lazy and will do whatever places them in the lowest energy state = which is the most stable state
In both examples, an electron moves from the 4s sublevel to produce a 1/2 full 3d (Cr) or completely filled 3d (Cu). This gives the atom greater stability so the change is favorable.
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Explanation:
The well-defined capacitance between one end-face and the cell is about 5 pF … parallel spins and attractive interaction between shells with antiparallel spins to explain the expansion … and Cr 1. Figure 3 provides an interesting comparison of the anomalous behaviour in physical …the same starting metal concentration (Cmo 22.0 mg/l). This re- sult could be explained with the … The above mentioned anomalous behaviour of Cd2+ is now confirmed by a kd value (0.012 hA1 … An explanation of this strange result can be pro- posed taking in mind that the outer …