MR. SURRETTE
VAN NUYS HIGH SCHOOL
CHAPTER 3: ELEMENTS AND ATOMIC STRUCTURE
WORKSHEET SOLUTIONS
1. This scientist discovered the electron.
1A. JJ Thomson
2. This scientist proposed the plum pudding model.
2A. JJ Thomson
3. This scientist disproved the plum pudding model.
3A. Ernest Rutherford
4. This scientist discovered the nucleus.
4A. Ernest Rutherford
5. This scientist coined the term “atom.”
5A. Democritus
6. This scientist first organized the periodic table.
6A. Mendeleev
7. Most of the atom’s mass and all of its __________ charge are contained in the __________.
7A. positive nucleus
8. The atom’s nucleus contains __________ and __________.
8A. protons neutrons
9. An atom with 16 protons, 17 neutrons and 18 electrons has a mass of __________ and a charge of
__________ and belongs to the element __________.
9A. 33 amu - 2 sulfur
10. Classify each of the following as a metal, a nonmetal, or a metalloid:
10a. Cl
A. non metal
10b. K
A. metal
10c. Si
A. metalloid
10d. N
A. nonmetal
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
11. Determine the group or family for each of the following.
11a. F
11b. Ca
A. halogen
A. alkaline metals
11c. Li
A. alkali metals
11d. N
A. not specified
12. A positive ion is called a(n) __________ , while a negative ion is called a(n) __________.
12A. cation anion
13. An iron isotope has 29 neutrons.
13a. What is the atomic symbol for iron?
A. Fe
13b. What is the Z value?
A. 26
13c. What is the A value?
A.
(1) A = Z + N
(2) A = 26 + 29
(3) A = 55
14. Ni-62 has how many protons and how many neutrons?
14A. 28 protons 34 neutrons
15. Gallium has two naturally occurring isotopes: Ga-69 and Ga-71. Ga-71 is 6.11% abundant. The
atomic mass of gallium is 69.72 amu.
15a. Calculate the natural abundance of Ga-69.
A.
(1) Total mass of gallium must equal 100%.
(2) 100 – 6.11 = 93.89
(3) Natural abundance for Ga-69 is 93.89%
15b. Out of 10,000 gallium atoms, how many would be Ga-69 and Ga-71?
A. 611 Ga-71 and 9389 Ga-69
16. Which of the following elements is diatomic?
16A.
(a) C (b) He (c) Au (d) H
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
CHAPTER 3: ELEMENTS AND ATOMIC STRUCTURE
QUIZ SOLUTIONS
1. These elements are somewhat good conductors of heat and electricity.
1A. metalloids
2. Group 1 elements of the periodic table are called the:
2A. alkali metals
3. Group 18 elements of the periodic table are called the:
3A. noble gases
4. This scientist discovered the electron.
4A. JJ Thomson
5. This scientist proposed the nuclear theory of the atom.
5A. Ernest Rutherford
6. This scientist developed the periodic table.
6A. Dmitri Mendeleev
7. Which of the following elements is diatomic?
(A) C
(B) Br
(C) Ag
(D) Ne
(E) Na
8. An atom with 15 protons, 17 neutrons and 18 electrons has a mass of __________ and a charge of
__________ and belongs to the element __________.
8A. 32 amu - 3 phosphorus
9. Convert 302 K into oC
9A.
(1) Tc = T – 273
(2) Tc = 302 – 273
(3) Tc = 29
(4) Tc = 2.9 x 101 oC
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
10. Convert 302 K into oF
10A.
(1) Tc = T – 273
(2) Tc = 302 – 273
(3) Tc = 29 oC
(4) TF = (9/5) Tc + 32
(5) TF = (9/5) (29 oC) + 32
(6) TF = 84.2 oF
(7) TF = 8.42 x 101 oF
(8) TF = 8.4 x 101 oF
11. Convert 10.18 mg/mL into ng/L
11A.
10.18 mg x
1g
x 109 ng x 1000 mL
---------------------------------------1 mL
1000 mg
1g
1L
= 1.018 x 1010 ng/L
12. Sc
12A. metal
13. I
13A. nonmetal
14. Kr
14A. nonmetal
15. Mg
15A. alkaline metals
16. Xe
16A. noble gases
17. Na
17A. alkali metals
18. Argon (atomic number 18) has three isotopes:
Ar-36: 35.97 amu 0.34% relative abundance
Ar-38: 37.96 amu 0.07% relative abundance
Ar-40: 39.96 amu 99.59% relative abundance
Based on these three isotopes, compute the atomic mass of argon.
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CHEMISTRY
MR. SURRETTE
VAN NUYS HIGH SCHOOL
18A.
(1) A (Ar) = (35.97 x 0.0034) + (37.96 x 0.0007) + (39.96 x 0.9959)
(2) A (Ar) = 0.122298 + 0.002772 + 39.796164
(3) A (Ar) = 39.921234 amu
(4) A (Ar) = 39.92 amu
19. C-12 has a natural abundance of 98.89%. Out of a random sample of 10,000 carbon atoms, how
many would not be C-12?
19A. 111
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CHEMISTRY