Name: 
 

Atomic Theory & Formulas


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
Which of the following postulates of Dalton's atomic theory are now known to be incorrect?

1.
Matter is made up of atoms.
2.
All atoms of a given element are identical.
3.
Atoms are indivisible and indestructible.
a.
1 only
b.
2 only
c.
3 only
d.
2 and 3
e.
1, 2, and 3
 

 2. 
Which of the following particles will not be deflected by charged plates?
a.
γ (gamma) particles
b.
β (beta) particles
c.
α (alpha) particles
d.
protons
e.
α (alpha) and β (beta) particles
 

 3. 
What is the atomic symbol for an element with 28 protons and 31 neutrons?
a.
atomictheory-formul_files/i0040000.jpg
b.
atomictheory-formul_files/i0040001.jpg
c.
atomictheory-formul_files/i0040002.jpg
d.
atomictheory-formul_files/i0040003.jpg
e.
atomictheory-formul_files/i0040004.jpg
 

 4. 
Which of the following atoms contains the largest number of protons?
a.
158Gd
b.
157Tb
c.
127I
d.
138Ba
e.
144Nd
 

 5. 
Which two of the atoms below have the same number of neutrons?
atomictheory-formul_files/i0060000.jpg, atomictheory-formul_files/i0060001.jpg, atomictheory-formul_files/i0060002.jpg, atomictheory-formul_files/i0060003.jpg,?
a.
atomictheory-formul_files/i0060004.jpg and atomictheory-formul_files/i0060005.jpg
b.
atomictheory-formul_files/i0060006.jpg and atomictheory-formul_files/i0060007.jpg
c.
atomictheory-formul_files/i0060008.jpg and atomictheory-formul_files/i0060009.jpg
d.
atomictheory-formul_files/i0060010.jpg and atomictheory-formul_files/i0060011.jpg
e.
atomictheory-formul_files/i0060012.jpg and atomictheory-formul_files/i0060013.jpg
 

 6. 
Isotopes of a given element have the same number of ____, but different numbers of ____ in their nucleus.
a.
neutrons, electrons
b.
electrons, protons
c.
protons, electrons
d.
neutrons, protons
e.
protons, neutrons
 

 7. 
What charge is likely on a monatomic silver cation?
a.
1-
b.
1+
c.
2+
d.
3+
e.
4+
 

 8. 
For a nonmetal in Group 5A of the periodic table, the most common monatomic ion will have a charge of ____.
a.
3-
b.
2-
c.
1-
d.
1+
e.
2+
 

 9. 
What is the correct formula for an ionic compound that contains aluminum ions and carbonate ions?
a.
AlCO3
b.
Al(CO3)2
c.
Al(CO3)3
d.
Al2(CO3)3
e.
Al3(CO3)2
 

 10. 
Sodium oxalate has the chemical formula Na2C2O4. Barium chloride is BaCl2.  Based on this information, the formula for barium oxalate is ____.
a.
Ba3(C2O4)2
b.
BaC2O4
c.
Ba(C2O4)2
d.
Ba2C2O4
e.
Ba3C2O4
 

 11. 
What is the formula of sodium bicarbonate, or baking soda?
a.
CH2ONa
b.
NaHCO3
c.
N2CO3
d.
Na2CO3
e.
H2CO3
 

 12. 
Nitrogen and oxygen form an extensive series of oxides with the general formula NxOy. What is the empirical formula for an oxide that contains 46.68% nitrogen?
a.
N2O
b.
NO
c.
NO2
d.
N2O3
e.
N2O5
 

 13. 
Acetylsalicylic acid, commonly known as aspirin, has 9 carbon atoms, 8 hydrogen atoms, and 4 oxygen atoms per molecule. What is the molecular formula of aspirin?
a.
C9He8O4
b.
C9H8O4
c.
C9H8Ox4
d.
Ca9H8O2
e.
C9(HO4)2
 

 14. 
An aluminum ion has ____ electrons.
a.
9
b.
10
c.
12
d.
13
e.
16
 

 15. 
What is the correct formula for an ionic compound that contains magnesium ions and fluoride ions?
a.
Mg2F
b.
MgF
c.
Mg2F2
d.
MgF2
e.
Mg2F3
 



 
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