Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

24. Transition Metals and Coordination Compounds

Paramagnetism and Diamagnetism

General Chemistry

24. Transition Metals and Coordination Compounds

Paramagnetism and Diamagnetism

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Multiple Choice

Which of the following atoms has the most unpaired electrons?

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Identify the electron configuration for each element. For example, Co (Cobalt) has an atomic number of 27, so its electron configuration is [Ar] 3d^7 4s^2.

Determine the number of electrons in the outermost d subshell for each element. For instance, Co has 7 electrons in the 3d subshell.

Apply Hund's rule, which states that electrons will fill an empty orbital before they pair up in an occupied one, to find the number of unpaired electrons in the d subshell.

Count the unpaired electrons for each element. For example, in Co, the 3d subshell has 3 unpaired electrons.

Compare the number of unpaired electrons for each element to determine which has the most. Mn (Manganese) with an electron configuration of [Ar] 3d^5 4s^2 has 5 unpaired electrons, which is the highest among the given options.