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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

2. Atoms & Elements

Ions

General Chemistry

2. Atoms & Elements

Ions

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Multiple Choice

How many electrons are present in a sulfur anion with a -2 charge?

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Identify the atomic number of sulfur (S), which represents the number of protons and, in a neutral atom, also the number of electrons. Sulfur has an atomic number of 16.

Understand that a neutral sulfur atom has 16 electrons, equal to its 16 protons.

Recognize that the sulfur anion has a charge of -2, meaning it has gained 2 extra electrons compared to the neutral atom.

Calculate the total number of electrons in the sulfur anion by adding the 2 extra electrons to the 16 electrons of the neutral atom using the formula: $\text{Total electrons} = 16 + 2$.

Conclude that the sulfur anion with a -2 charge has 18 electrons.