The elements having the ground-state electronic configurations different from what we would expect from their positions in the periodic table are to be listed. Concept Introduction: The distribution of the electrons present in an atom in the respective atomic orbitals is known as the electronic configuration. However, some elements have different ground-state configurations than expected from their placement in the periodic table. To determine: The elements having different ground-state configurations than expected from their placement in the periodic table.
The elements having the ground-state electronic configurations different from what we would expect from their positions in the periodic table are to be listed. Concept Introduction: The distribution of the electrons present in an atom in the respective atomic orbitals is known as the electronic configuration. However, some elements have different ground-state configurations than expected from their placement in the periodic table. To determine: The elements having different ground-state configurations than expected from their placement in the periodic table.
The elements having the ground-state electronic configurations different from what we would expect from their positions in the periodic table are to be listed.
Concept Introduction:
The distribution of the electrons present in an atom in the respective atomic orbitals is known as the electronic configuration. However, some elements have different ground-state configurations than expected from their placement in the periodic table.
To determine: The elements having different ground-state configurations than expected from their placement in the periodic table.
Expert Solution & Answer
Answer to Problem 140AE
Answer
The elements
Cr,Cu,Nb,Mo,Tc,Ru,Rh,Pd,Ag,Pt,AuandRg exhibit electronic configurations different from their expected ones.
Explanation of Solution
The filling of orbitals according to their energy levels gives the expected ground-state electronic configurations for the elements. And the following elements exhibit ground-state configurations that are different from what was expected with respect to their placement in the periodic table.
In the case of Chromium and copper, the expected configuration in accordance to the Aufbau principle would be,
This happens as completely filled sub levels are more stable than the partly filled ones. Also, a half filled sub level is more stable than the partly filled one.
In the case of Niobium, the expected configuration in accordance to the Aufbau principle would be,
Nb=(1s22s22p63s23p63d104s24p65s24d3)
But the actual configuration it exhibits is,
Nb=(1s22s22p63s23p63d104s24p65s14d4)
The repulsion of two electrons within the same orbital pushes one electron from the
5s to the
4d orbital.
Some other elements that exhibit electronic configurations different from expected ones are,
The compounds that portray the
d10 systems do so in order to attain extra stability. In case of the
RuandRh, such configurations are attained by these compounds in order to attain extra stability by attaining a completely filled
T2g orbitals.
Conclusion
The elements having the ground-state electronic configurations different from what we would expect from their positions in the periodic table are
Cr,Cu,Nb,Mo,Tc,Ru,Rh,Pd,Ag,Pt,AuandRg.
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b) Certain cyclic compounds are known to be conformationally similar to carbohydrates, although they are not
themselves carbohydrates. One example is Compound C shown below, which could be imagined as adopting
four possible conformations. In reality, however, only one of these is particularly stable. Circle the conformation
you expect to be the most stable, and provide an explanation to justify your choice. For your explanation to be
both convincing and correct, it must contain not only words, but also "cartoon" orbital drawings contrasting the
four structures.
Compound C
Possible conformations (circle one):
Дет
Lab Data
The distance entered is out of the expected range.
Check your calculations and conversion factors.
Verify your distance. Will the gas cloud be closer to the cotton ball with HCI or NH3?
Did you report your data to the correct number of significant figures?
- X
Experimental Set-up
HCI-NH3
NH3-HCI
Longer Tube
Time elapsed (min)
5 (exact)
5 (exact)
Distance between cotton balls (cm)
24.30
24.40
Distance to cloud (cm)
9.70
14.16
Distance traveled by HCI (cm)
9.70
9.80
Distance traveled by NH3 (cm)
14.60
14.50
Diffusion rate of HCI (cm/hr)
116
118
Diffusion rate of NH3 (cm/hr)
175.2
175.2
How to measure distance and calculate rate
For the titration of a divalent metal ion (M2+) with EDTA, the stoichiometry of the reaction is typically:
1:1 (one mole of EDTA per mole of metal ion)
2:1 (two moles of EDTA per mole of metal ion)
1:2 (one mole of EDTA per two moles of metal ion)
None of the above
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