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

9. Quantum Mechanics

Bohr Model

General Chemistry

9. Quantum Mechanics

Bohr Model

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Multiple Choice

According to the Bohr theory of the hydrogen atom, what is the minimum energy (in J) needed to ionize a hydrogen atom from the n=2 state?

1.64 x 10^-18 J

2.18 x 10^-18 J

3.03 x 10^-19 J

5.45 x 10^-19 J

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Verified step by step guidance

Understand that ionization energy is the energy required to remove an electron completely from an atom. For hydrogen, this involves moving the electron from its current energy level to infinity.

Recall the Bohr model formula for the energy of an electron in a hydrogen atom:

E = - R

_Hn2, where

R

_H is the Rydberg constant (approximately

2.18 \times 10^{- 18}

J) and

n

is the principal quantum number.

Calculate the energy of the electron in the n=2 state using the formula:

E = - \frac{2.18 \times 10^{- 18}}{2^{2}}

Recognize that the energy needed to ionize the atom from the n=2 state is the difference between the energy at n=2 and the energy at n=infinity (which is 0). Therefore, the ionization energy is simply the absolute value of the energy calculated for n=2.

Compare the calculated ionization energy with the given options to identify the correct answer.