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# Particles of Matter Practice Test

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By McGraw-Hill Professional
Updated on Sep 5, 2011

Review the following concepts if needed:

## Particles of Matter Practice Test

A good score is eight correct. Answers are given at the end.

1. Suppose that an isotope of nitrogen contains seven electrons and seven neutrons. What, approximately, is the atomic mass of this element?

(a) 7 amu

(b) 14 amu

(c) 49 amu

(d) It cannot be determined from this information.

2. A mysterious particle X collides with a proton, and the two completely annihilate each other in a burst of energy. We can conclude that particle X was

(a) a positron.

(b) a neutron.

(c) an electron.

(d) an antiproton.

3. Neutrons are

(a) stable all by themselves but unstable when in the nuclei of atoms.

(b) unstable all by themselves but stable when in the nuclei of atoms.

(c) stable under all conditions.

(d) unstable under all conditions.

4. The atoms in a compound

(a) share a single nucleus.

(b) share protons.

(c) share electrons.

(d) share neutrons.

5. Examine Fig. 9-3. How many electrons are in the outer shell of the oxygen atom when the two atoms of hydrogen each share an electron with it?

(a) 2

(b) 6

(c) 8

(d) 10

6. Two different elements can never have the same number of

(a) protons.

(b) neutrons.

(c) electrons.

(d) nuclei.

7. The number of neutrons in an element’s nucleus determines the

(a) isotope of the element.

(b) ion of the element.

(c) atomic number of the element.

(d) No! Neutrons never exist in atomic nuclei.

8. The mass of a neutron

(a) is slightly greater than the mass of an electron.

(b) is much greater than the mass of an electron.

(c) is slightly less than the mass of a proton.

(d) is much less than the mass of a proton.

9. Suppose that an atom of argon, whose atomic number is 18, has 16 electrons. This atom is

(a) a positive ion.

(b) a negative ion.

(c) a positive isotope,

(b) a negative isotope.

10. There were 92 different kinds of atoms discovered when scientists began to refine the atomic theory. These 92 unique entities are known as

(a) molecules.

(b) compounds.

(c) isotopes.

(d) elements.

1. b

2. d

3. b

4. c

5. c

6. a

7. a

8. b

9. a

10. d

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