Atoms, Ions, Light
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. Which is the correct measurement for the location marked by the arrow?
a. 50.2
b. 51.8
____
c. 52
d. 51
2. Which is the correct measurement for the location marked by the arrow?
a. 17.076
b. 17.8
c. 17.76
d. 17.7
____
3. Which value has 4 significant figures (digits)?
a. 6.930
c. 8450
b. 0.0450
d. 0.392
____
4. How many significant figures(digits) are in the value 0.0050340?
a. 3
c. 7
b. 5
d. 8
____
5. The box for an element from the periodic table is shown. Which letter represents the atomic mass?
a. A
c. C
b. B
d. D
____
6. The box for an element from the periodic table is shown. Which letter represents the atomic number?
a. A
c. C
b. B
d. D
____
7. Which has a charge of +1?
a. proton
b. atom
c. electron
d. neutron
Atom
1
2
3
4
Atoms
Protons
Neutrons
8
10
10
9
9
9
8
11
Electrons
8
10
9
8
____
8. Which two are isotopes of one another? (look at chart above)
a. Atoms 1 & 2
c. Atoms 1 & 3
b. Atoms 2 & 3
d. Atoms 1 & 4
____
9. Which two have the same mass? (look at chart above)
a. Atoms 1 & 2
b. Atoms 2 & 4
Atom
Sodium
Chlorine
Protons
c. Atoms 1 & 4
d. Atoms 2 & 3
Atoms
Neutrons
12
17
Electrons
17
Mass Number
23
35
____ 10. How many neutrons are in an atom of chlorine?
a. 17
c. 34
b. 18
d. 35
____ 11. How many electrons are in a neutral atom of sodium?
a. 22
c. 12
b. 11
d. 23
____ 12. Which is the correct symbol for the atom with 42 protons and 49 neutrons?
a.
c.
b.
____ 13. Which is the number of protons in
a. 26
b. 30
____ 14. Which is the number of neutrons in
a. 35
b. 45
____ 15. Which element has 14 protons?
a. Nitrogen
b. Silicon
d.
?
c. 56
d. 82
?
c. 80
d. 115
c. Aluminum
d. Sulfur
____ 16. According to the modern concept of the atom, which are located in the nucleus of an atom?
a. electrons and protons
c. neutrons and electrons
b. protons only
d. protons and neutrons
____ 17. An atom has 23 protons and 29 neutrons. Which is the correct chemical symbol for this atom?
a.
c.
b.
d.
____ 18. Which label identifies the wavelength of the wave shown? (in the diagram above)
a. A
c. C
b. B
d. D
____ 19. Which diagram shows a wave with the highest frequency? (refer to table above)
a. A
c. C
b. B
d. D
____ 20. Which diagram shows a wave with the longest wavelength? (refer to table above)
a. A
c. C
b. B
d. D
____ 21. Which type of wave has a frequency of approximately 108 hertz? (use diagram above to help)
a. AM radio
c. X-rays
b. ultraviolet light
d. TV, FM Radio, Cell phone
____ 22. Which type of wave has a wavelength of approximately 10-12 meters? (refer to diagram above for help)
a. microwaves
c. Gamma rays
b. ultraviolet light
d. AM radio
____ 23. Which type of orbital is shown?
a. s
b. p
c. d
d. f
____ 24. Which is the correct number of valence electrons in the element with the following electron configuration: 1s 2
2s2 2p4?
a. 16
c. 2
b. 6
d. 4
____ 25. Which element has the electron configuration 1s22s22p63s23p64s13d5?
a. Titanium (Ti)
c. Sulfur (S)
b. Chromium (Cr)
d. Selenium (Se)
____ 26. Which is the correct electron configuration for the element Molybdenum (Mo)?
a. 1s22s22p63s23p64s23d4
c. 1s22s22p63s23p64s24d104p65s25d4
b. 1s22s22p63s23p64s23d104p65s6
d. 1s22s22p63s23p64s23d104p65s24d4
____ 27. Which of these elements has 5 valence electrons?
a. Boron (B)
c. Vanadium (V)
b. Rubidium (Rb)
d. Arsenic (As)
____ 28. Use Plank’s constant, 6.626  10-34 J s, to solve the following:
What is the amount of energy carried by a photon that has a frequency of 5.71  1014 Hz?
a. 525 nm
c. 1.14  10-8 J
-19
b. 3.78  10 J
d. 8.62  1047 J/s
____ 29. What is the frequency of a light wave with a wavelength of 680 nm? (remember that a nanometer = 10-9
meters; c = 3.0 x 108 m/s)
a. 4.41  1016 Hz
c. 4.41  105 Hz
b. 2.04 s
d. 4.41  1014 Hz
____ 30. How many valence (outter shell) electrons are present in silicon?
a. One
c. Four
b. Two
d. Six
Atoms, Ions, Light
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
ANS: B
ANS: C
ANS: A
ANS: B
ANS: D
ANS: B
ANS: A
ANS: D
ANS: B
ANS: B
ANS: B
ANS: B
ANS: A
ANS: B
ANS: B
ANS: D
ANS: D
ANS: A
ANS: D
ANS: D
ANS: D
ANS: C
ANS: B
ANS: B
ANS: B
ANS: D
ANS: D
ANS: B
ANS: D
ANS: C
The electron configuration of silicon is 1s22s22p63s23p2.