Unit 4 Exam Review

Question 1

What is the next atomic orbital in the series: 1s, 2s, 2p, 3s, 3p, ___:?

Answer 1

4s

Question 2

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

Answer 2

In orbits

Question 3

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

Answer 3

decreases

Question 4

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

Answer 4

counterclockwise

Question 5

What is the approximate energy of a photon having a frequency of 4.0 x 10^15 Hz? (h = 6.63 x 10^-34 J•s):

Answer 5

2.7 x 10^-18 J

Question 6

Which of the following would be most stable:
     •4d^5
     •4d^4
     •4d^10
     •4f^6

Answer 6

4d^10

Question 7

How any unpaired electrons are in a sulfur atom (Z = 16)?:

Answer 7

2

Question 8

According to the Heisenberg Uncertainty Principle, if the position of a moving particle is known, what other quantity CANNOT be known?:

Answer 8

velocity

Question 9

Which of the the following has the highest frequency?:
     •x-rays
     •gamma rays
     •radio waves
     •UV rays

Answer 9

gamma rays

Question 10

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

Answer 10

the same

Question 11

The principle quantum number indicates what property of an electron?:

Answer 11

the energy level of the electron

Question 12

Which scientist developed the quantum mechanical model of the atom?:

Answer 12

Schrödinger

Question 13

What is the maximum number of electrons in the second principle energy level?:

Answer 13

8

Question 14

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

Answer 14

1 electron in each orbital

Question 15

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

Answer 15

must absorb a photon of energy

Question 16

According to the Aufbau Principle, electrons enter orbitals of _____ first:

Answer 16

lowest energy

Question 17

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

Answer 17

7

Question 18

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

Answer 18

s,p, and d

Question 19

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

Answer 19

it would be the same

Question 20

How many energy sublevels are in the second principle energy level?:

Answer 20

2

Question 21

Emission of light from an atom occurs when an electron ____:

Answer 21

moves from a higher to lower energy level, and releases a photon

Question 22

Who predicted that all matter can be waves as well as particles?:

Answer 22

de Broglie

Question 23

What are quanta of light called?:

Answer 23

photons

Question 24

Stable electron configurations are likely to contain ____:

Answer 24

completely filled energy sublevels

Question 25

What is the maximum number of “d” orbitals in a principle energy level?:

Answer 25

5

Question 26

How are frequency and wavelength of light related?:

Answer 26

inversely proportional

Question 27

Which electron configuration would be more stable:
     •3d^3
     •3d^5
     •3d^7
     •3d^10

Answer 27

3d^10

Question 28

Which variable is directly proportional to frequency:
     •energy
     •wavelength
     •the speed of light
     •mass

Answer 28

energy

Question 29

Which colour of visible light has the shortest wavelength?:

Answer 29

violet