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

2. Atoms & Elements

Isotopes

General Chemistry

2. Atoms & Elements

Isotopes

Previous problemNext problem

Struggling with General Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following isotopes has the same number of neutrons as phosphorus-31?

Silicon-30

Sulfur-32

Chlorine-35

Argon-40

Previous problemNext problem

Verified step by step guidance

Identify the number of neutrons in phosphorus-31. The atomic number of phosphorus (P) is 15, which means it has 15 protons. The number of neutrons is calculated by subtracting the atomic number from the mass number: 31 - 15 = 16 neutrons.

Determine the number of neutrons in silicon-30. Silicon (Si) has an atomic number of 14, so it has 14 protons. Calculate the number of neutrons: 30 - 14 = 16 neutrons.

Determine the number of neutrons in sulfur-32. Sulfur (S) has an atomic number of 16, so it has 16 protons. Calculate the number of neutrons: 32 - 16 = 16 neutrons.

Determine the number of neutrons in chlorine-35. Chlorine (Cl) has an atomic number of 17, so it has 17 protons. Calculate the number of neutrons: 35 - 17 = 18 neutrons.

Determine the number of neutrons in argon-40. Argon (Ar) has an atomic number of 18, so it has 18 protons. Calculate the number of neutrons: 40 - 18 = 22 neutrons.