Chemistry Chapter 4C (Prentice)
 
Name:     ID: 
 
Email: 

Chemistry Chapter 4C (Prentice)

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

 1. 

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
 

 2. 

An element has an atomic number of 10. The number of protons and electrons in a neutral atom of the element are ____.
a.
20 protons and 10 electrons
c.
5 protons and 5 electrons
b.
10 protons and 0 electrons
d.
10 protons and 10 electrons
 

 3. 

An element has an atomic number of 20. The number of protons and electrons in a neutral atom of the element are ____.
a.
20 protons and 20 electrons
c.
10 protons and 10 electrons
b.
20 protons and 0 electrons
d.
40 protons and 20 electrons
 

 4. 

An element has an atomic number of 44. The number of protons and electrons in a neutral atom of the element are ____.
a.
44 protons and 44 electrons
c.
44 protons and 0 electrons
b.
88 protons and 44 electrons
d.
22 protons and 22 electrons
 

 5. 

An element has an atomic number of 58. The number of protons and electrons in a neutral atom of the element are ____.
a.
58 protons and 58 electrons
c.
29 protons and 29 electrons
b.
116 protons and 58 electrons
d.
58 protons and 0 electrons
 

 6. 

An element has an atomic number of 42. The number of protons and electrons in a neutral atom of the element are ____.
a.
42 protons and 42 electrons
c.
21 protons and 21 electrons
b.
84 protons and 42 electrons
d.
42 protons and 0 electrons
 

 7. 

An element has an atomic number of 34. The number of protons and electrons in a neutral atom of the element are ____.
a.
17 protons and 17 electrons
c.
34 protons and 0 electrons
b.
68 protons and 34 electrons
d.
34 protons and 34 electrons
 

 8. 

An element has an atomic number of 12. The number of protons and electrons in a neutral atom of the element are ____.
a.
12 protons and 0 electrons
c.
6 protons and 6 electrons
b.
12 protons and 12 electrons
d.
24 protons and 12 electrons
 

 9. 

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
 

 10. 

In which of the following is the number of neutrons correctly represented?
a.
mc010-1.jpgF has 0 neutrons.
c.
mc010-3.jpgMg has 24 neutrons.
b.
mc010-2.jpgAs has 108 neutrons.
d.
mc010-4.jpgU has 146 neutrons.
 

 11. 

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.
 

 12. 

Which of the following isotopes has the same number of neutrons as phosphorus-31?
a.
mc012-1.jpgP
c.
mc012-3.jpgSi
b.
mc012-2.jpgS
d.
mc012-4.jpgSi
 

 13. 

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

 14. 

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
 

 15. 

Which of the following statements is NOT true?
a.
Protons have a positive charge.
b.
Electrons are negatively charged and have a mass of 1 amu.
c.
The nucleus of an atom is positively charged.
d.
Neutrons are located in the nucleus of an atom.
 

 16. 

Why do chemists use relative masses of atoms compared to a reference isotope rather than the actual masses of the atoms?
a.
The actual mass of an electron is very large compared to the actual mass of a proton.
b.
The actual masses of atoms are very small and difficult to work with.
c.
The number of subatomic particles in atoms of different elements varies.
d.
The actual masses of protons, electrons, and neutrons are not known.
 

 17. 

The atomic mass of an element is the ____.
a.
total number of subatomic particles in its nucleus
b.
weighted average of the masses of the isotopes of the element
c.
total mass of the isotopes of the element
d.
average of the mass number and the atomic number for the element
 

 18. 

The atomic mass of an element depends upon the ____.
a.
mass of each electron in that element
b.
mass of each isotope of that element
c.
relative abundance of protons in that element
d.
mass and relative abundance of each isotope of that element
 

 19. 

Which of the following is necessary to calculate the atomic mass of an element?
a.
the atomic mass of carbon-12
b.
the atomic number of the element
c.
the relative masses of the element’s protons and neutrons
d.
the masses of each isotope of the element
 

Numeric Response
 

 20. 

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

 

 21. 

What is the atomic number for an element with 38 neutrons and a mass number of 74?

 

 22. 

What is the atomic number for an element with 46 neutrons and a mass number of 90?

 

 23. 

What is the atomic number for an element with 43 neutrons and a mass number of 84?

 

 24. 

What is the atomic number for an element with 44 neutrons and a mass number of 86?

 

 25. 

What is the atomic number for an element with 36 neutrons and a mass number of 70?

 

 26. 

What is the mass number for an oxygen atom that has 10 neutrons in its nucleus?

 

 27. 

How many protons are present in the nuclei of the three known isotopes of hydrogen?

 

 28. 

Use the periodic table to determine the number of neutrons in nitrogen-14.

 

 29. 

How many neutrons are present in an atom of the isotope nr029-1.jpgU?

 

 30. 

Calculate the number of neutrons in nr030-1.jpgPb.

 



 
         Start Over