Chemistry Chapter 4B (Prentice)
 
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Chemistry Chapter 4B (Prentice)

Matching
 
 
Match each item with the correct statement below.
a.
mass number
d.
atomic mass
b.
atomic mass unit
e.
isotope
c.
atomic number
 

 1. 

 atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom
 

 2. 

 the total number of protons and neutrons in the nucleus of an atom
 

 3. 

 the number of protons in the nucleus of an element
 

 4. 

 the weighted average of the masses of the isotopes of an element
 

 5. 

 one-twelfth the mass of a carbon atom having six protons and six neutrons
 

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

 6. 
An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.
a.
152 protons and 76 electrons
c.
38 protons and 38 electrons
b.
76 protons and 0 electrons
d.
76 protons and 76 electrons
 

 7. 
The sum of the protons and neutrons in an atom equals the ____.
a.
atomic number
c.
atomic mass
b.
nucleus number
d.
mass number
 

 8. 
What does the number 84 in the name krypton-84 represent?
a.
the atomic number
c.
the sum of the protons and electrons
b.
the mass number
d.
twice the number of protons
 

 9. 
All atoms of the same element have the same ____.
a.
number of neutrons
c.
mass numbers
b.
number of protons
d.
mass
 

 10. 
Isotopes of the same element have different ____.
a.
numbers of neutrons
c.
numbers of electrons
b.
numbers of protons
d.
atomic numbers
 

 11. 
Isotopes of the same element have different ____.
a.
positions on the periodic table
c.
atomic numbers
b.
chemical behavior
d.
mass numbers
 

 12. 
In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?
a.
In, 49 protons, 49 electrons
c.
Cs, 55 protons, 132.9 electrons
b.
Zn, 30 protons, 60 electrons
d.
F, 19 protons, 19 electrons
 

 13. 
The mass number of an element is equal to ____.
a.
the total number of electrons in the nucleus
b.
the total number of protons and neutrons in the nucleus
c.
less than twice the atomic number
d.
a constant number for the lighter elements
 

 14. 
Using the periodic table, determine the number of neutrons in mc014-1.jpgO.
a.
4
c.
16
b.
8
d.
24
 

 15. 
How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?
a.
50 protons, 50 electrons, 75 neutrons
c.
120 neutrons, 50 protons, 75 electrons
b.
75 electrons, 50 protons, 50 neutrons
d.
70 neutrons, 75 protons, 50 electrons
 

 16. 
Which of the following statements is NOT true?
a.
Atoms of the same element can have different masses.
b.
Atoms of isotopes of an element have different numbers of protons.
c.
The nucleus of an atom has a positive charge.
d.
Atoms are mostly empty space.
 

 17. 
If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?
1. mc017-1.jpgE2. mc017-2.jpgE3. mc017-3.jpgE4. mc017-4.jpgE
a.
1 and 2
c.
1 and 4
b.
3 and 4
d.
2 and 3
 

 18. 
Select the correct symbol for an atom of tritium.
a.
mc018-1.jpgn
c.
mc018-3.jpgH
b.
mc018-2.jpgH
d.
mc018-4.jpgH
 

 19. 
Which of the following sets of symbols represents isotopes of the same element?
a.
mc019-1.jpgJ      mc019-2.jpgJ     mc019-3.jpgJ
c.
mc019-7.jpgM   mc019-8.jpgM   mc019-9.jpgM
b.
mc019-4.jpgL     mc019-5.jpgL     mc019-6.jpgL
d.
mc019-10.jpgQ  mc019-11.jpgQ   mc019-12.jpgQ
 

 20. 
How is the number of neutrons in the nucleus of an atom calculated?
a.
Add the number of electrons and protons together.
b.
Subtract the number of electrons from the number of protons.
c.
Subtract the number of protons from the mass number.
d.
Add the mass number to the number of electrons.
 

 21. 
In which of the following is the number of neutrons correctly represented?
a.
mc021-1.jpgF has 0 neutrons.
c.
mc021-3.jpgMg has 24 neutrons.
b.
mc021-2.jpgAs has 108 neutrons.
d.
mc021-4.jpgU has 146 neutrons.
 

 22. 
How do the isotopes hydrogen-1 and hydrogen-2 differ?
a.
Hydrogen-2 has one more electron than hydrogen-1.
b.
Hydrogen-2 has one neutron; hydrogen-1 has none.
c.
Hydrogen-2 has two protons; hydrogen-1 has one.
d.
Hydrogen-2 has one proton; hydrogen-1 has none.
 

 23. 
Which of the following isotopes has the same number of neutrons as phosphorus-31?
a.
mc023-1.jpgP
c.
mc023-3.jpgSi
b.
mc023-2.jpgS
d.
mc023-4.jpgSi
 

 24. 
What unit is used to measure weighted average atomic mass?
a.
amu
c.
angstrom
b.
gram
d.
nanogram
 

 25. 
Which of the following equals one atomic mass unit?
a.
the mass of one electron
b.
the mass of one helium-4 atom
c.
the mass of one carbon-12 atom
d.
one-twelfth the mass of one carbon-12 atom
 

Numeric Response
 

 26. 
How many protons are present in an atom of Be-9?

 

 27. 
What is the total number of subatomic particles in the nucleus of an atom of nr027-1.jpgBi?

 

 28. 
Determine the number of electrons in an atom of iridium.

 

 29. 
What is the atomic number for an element with 41 neutrons and a mass number of 80?

 

 30. 
How many electrons are in an atom of gold?

 



 
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