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Atomic Structure and Isotopes Test-RE-TAKE

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

 1. 

A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is ____.
a.
26
c.
52
b.
30
d.
56
 

 2. 

The particles that make up an atom are ____.
a.
electrons, protons, and nuclei
c.
protons, neutrons, and nuclei
b.
elements, protons, and electrons
d.
protons, neutrons, and electrons
 
 
nar002-1.jpg
Figure 8
 

 3. 

Figure 8 shows the periodic table entry for hydrogen. How many neutrons do most hydrogen atoms have?
a.
0
c.
2
b.
1
d.
3
 
 
nar003-1.jpg
Figure 7
 

 4. 

Figure 7 shows Bohr models of two atoms. The models shown represent two different _____.
a.
molecules
c.
ions
b.
isotopes
d.
elements
 

 5. 

Neutrons keep an atom stable by _____.
a.
attracting protons
c.
separating electrons
b.
attracting electrons
d.
separating protons
 

 6. 

Which of these statements about matter is NOT true?
a.
During chemical changes, matter is destroyed.
b.
Matter has mass and takes up space.
c.
Matter can be divided into pure substances and mixtures.
d.
Matter is made up of atoms.
 

 7. 

Which particles have almost the same mass?
a.
proton and electron
c.
electron and neutron
b.
proton and neutron
d.
all three particles
 

 8. 

The energy levels of an atom are occupied by ____.
a.
electrons
c.
neutrons
b.
protons
d.
ions
 
 
nar004-1.jpg
Figure 1
 

 9. 

Which of the models in Figure 1 shows a negatively charged ion?
a.
model A
c.
model C
b.
model B
d.
model D
 
 
nar001-1.jpg
Figure 7
 

 10. 

Figure 7 shows an entry in the periodic table. What is the atomic mass of this element?
a.
23
c.
51
b.
27
d.
74
 

Completion
Complete each statement.
 

 11. 

All matter is made up of particles called ____________________.
 

 

 12. 

Chlorine-35 and chlorine-37 have a different number of ____________________.
 

 

 13. 

Most of the mass of an atom is located in its ____________________.
 

 

 14. 

Of the three main subatomic particles, the ____________________ has the least mass.
 

 

 15. 

The likely location of the negatively charged particles in an atom is called a(n) ____________________.
 

 

 16. 

Chlorine-35 and chlorine-37 are examples of ____________________.
 

 



 
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