Table of contents

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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

What is the charge of an atom with 15 protons and 18 electrons?

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Identify the number of protons and electrons in the atom. Here, the atom has 15 protons and 18 electrons.

Recall that the charge of an atom is determined by the difference between the number of protons (positive charges) and electrons (negative charges).

Calculate the net charge by subtracting the number of protons from the number of electrons: $\text{Charge} = \text{Number of protons} - \text{Number of electrons}$.

Substitute the values: $\text{Charge} = 15 - 18$.

Interpret the result: if the charge is negative, the atom has gained electrons and is negatively charged; if positive, it has lost electrons and is positively charged.