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Unit 4 – Electrons. Exam Review. 1. What is the next atomic orbital in the series: 1s, 2s, 2p, 3s, 3p, ? A. 3d B. 4s C. 4p D. 3f. 2. In Bohr’s model of the atom, where are the electrons? A. Evenly throughout the entire atom. B. In orbitals . C. In orbits.

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slide3

2. In Bohr’s model of the atom, where are the electrons?

A. Evenly throughout the entire atom.

B. In orbitals.

C. In orbits.

D. His model did not include electrons.

slide4

3. How does the energy of an electron change when the electron moves closer to the nucleus?

A. increases

B. decreases

C. remains the same

slide5

4. If the spin of one electron in an orbital is “clockwise”, what is the spin of the other electron in that orbital?

A. clockwise

B. counterclockwise

C. it doesn’t spin because the cancel each other

D. towards the nucleus

slide6

5. What is the approximate energy of a photon having a frequency of 4.0 x 1015 Hz? (h = 6.63 x 10-34 J . s)

A. 1.7 x 10-41 J

B. 1.678 x 10-41 J

C. 2.652 x 10-18 J

D. 2.7 x 10-18 J

slide9

8. According to the Heisenberg uncertainty principle, if the position of a moving particle is known, what other quantity CANNOT be known?

A. energy

B. velocity

C. mass

D. none of the above

slide10

Which of the following has the highest frequency:

A. x-rays

B. gamma rays

C. radio waves

D. UV rays

slide11

10. What is the electron configuration of potassium?

A. [Ar]4s1

B. [Ne]4s1

C. 1s12s12p63p6

D. 1s22p63s23p64s1

slide12

11. What is the number of electrons in the outermost energy level of an oxygen atom?

A. 4

B. 6

C. 8

D. 10

slide13

12. How does the speed of visible light compare with the speed of gamma rays, when both speeds are measured in a vacuum?

A. slower

B. faster

C. the same

D. you can’t compare them

slide14

13. The principal quantum number indicates what property of an electron?

A. the energy level of the electron

B. the spin of the electron

C. the sublevel of the electron

D. the shape of the orbital

slide15

14. Which scientist developed the quantum mechanical model of the atom?

A. Bohr

B. Heisenberg

C. de Broglie

D. Schrödinger

slide16

15. What is the maximum number of electrons in the second principal energy level?

A. 2

B. 8

C. 18

D. 32

slide17

16. If three electrons are available to fill three empty 2p atomic orbitals, how will the electrons be distributed?

A. All in one orbital

B. 2 of them will be in one orbital; 1 in another

C. 1 electron in each orbital

D. they can’t all fit in the 2p orbitals

slide18

17. What is the wavelength of a wave that has a frequency of 60. MHz?

A. 5.0 x 106 m

B. 5.0 m

C. 5.0 x 103 m

D. 5.0 x 10-1 m

slide19

18. When an electron moves from a lower to a higher energy level, the electron _____.

A. must give off a photon of energy

B. must absorb a photon of energy

C. must slow down

D. must stay in the same position

slide20

19. According to the aufbau principle, electrons enter orbitals of ___ first.

A. lowest energy

B. highest energy

C. lowest monemtum

D. highest momentum

slide21

20. What is the maximum number of “f” orbitals in any single energy level of an atom?

A. 1

B. 3

C. 5

D. 7

slide22

21. What types of atomic orbitals (s, p, d, or f) are in the third principal energy level?

A. s and p

B. s, p, and f

C. s, p, and d

D. s, p, d, and f

slide23

22. How would the atomic emission spectra of a sodium atom on Earth compare with sodium in the sun?

A. it would be the same

B. it would be different

C. you can’t compare the two

D. sodium doesn’t have an emission spectra

slide25

24. Emission of light from an atom occurs when an electron _____.

A. moves from a lower to higher energy level

B. moves from a higher to lower energy level

C. releases a photon

D. both b and c

slide26

25. Who predicted that all matter can behave as waves as well as particles?

A. Bohr

B. Schrödinger

C. de Broglie

D. Plank

slide27

26. What are quanta of light called?

A. quantums

B. photons

C. electrons

D. radiation

slide28

27. Stable electron configurations are likely to contain ____.

A. completely filled energy sublevels

B. 3 electrons in the energy level

C. equal number of electrons and neutrons

D. all of the above

slide29

28. What is the maximum number of “d” orbitals in a principal energy level?

A. 1

B. 3

C. 5

D. 7

slide30

29. How are frequency and wavelength of light related?

A. directly proportional

B. inversely proportional

C. the have no relation

slide32

31. Which variable is directly proportional to frequency:

A. energy B. wavelength

C. the speed of light

D. mass

slide33

32. Which color of visible light has the shortest wavelength?

A. red

B. blue

C. indigo

D. violet

slide34

33. How many electrons are in the highest occupied energy level of a neutral atom of arsenic?

A. 2

B. 5

C. 10

D. 15

answers
ANSWERS

1. B 11. B 21. C 31. A

2. C 12. C 22. A 32. D

3. B 13. A 23. B 33. B

4. B 14. D 24. D

5. D 15. B 25. C

6. C 16. C 26. B

7. C 17. B 27. A

8. B 18. B 28. C

9. B 19. A 29. B

10. A 20. D 30. D

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