Which of the following statements is true?

A. The valence electrons are always paired in the valence shell.
B. The valence electrons are only from s and p orbitals in the valence shell.
C. All of the electrons in the valence shell are valence electrons.
D. Paired valence electrons are more unstable than unpaired valence electrons.
E. Nonbonding electrons are not found in the valence shell.


Answer: B

Environmental & Atmospheric Sciences

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The higher the temperature, the more likely it is that a rock will deform ________.

A) elastically
B) ductilely
C) brittlely
D) shearingly

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The most direct and fundamental relationship between overgrazing and soil erosion is that

A. overgrazing causes eutrophication. B. overgrazing leads to the loss of vegetation. C. overgrazing leads to soil compaction. D. overgrazing increases that amount of suspended particles in the air.

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Which of the following is NOT a characteristic of the atmosphere?

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