Page 136 - Science Course 2 (Book 1)

4. The exact positions of the electrons in an atom cannot be determined because electrons are always
A. moving.
B. sharing.
C. changing.

5. Compared with electrons that are closer to the nucleus, those that are farther away have
A. less energy.
B. more energy.
C. equal energy.

6. The electrons that form bonds with other atoms are the
A. midlevel electrons.
B. innermost electrons.
C. outermost electrons.

7. A neutral atom of an element has the same number of
A. protons and neutrons.
B. protons and electrons.
C. neutrons and electrons.

Mo5-L1: Lesson Review Quiz (True or False)

Direction: On the line before each statement, write T if the statement is true or F if the statement is false.

1. The atomic number of an element equals the number of neutrons in an atom of that element.
2. The exact position of electrons of an atom cannot be determined.

3. The electrons closest to the nucleus of an atom have the least amount of energy.
4. The number of valence electrons in an atom tells you how many chemical bonds that atom can form.

Mo5-L1: Lesson Review Quiz (Multiple Choice)

Direction: On the line before each question or statement, write the letter of the correct answer.

5. The number of bonds an atom can form is represented in an electron dot diagram by
A. pairs of dots
B. unpaired dots
C. total number of dots
6. Which part of an atom participates in chemical bonding?
A. proton
B. neutron
C. electron
7. An electron dot diagram shows
A. the number of valence electrons.
B. the strength of electron energy fields.
C. the spacing arrangement of electrons.
8. Except for helium atoms, atoms tend to gain, lose, or share valence electrons until they have
____________ valence electrons.
A. no
B. four
C. eight

9 – 10. Determine how an electron dot diagram provides information on the number of bonds an atom of a
certain element can form.

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