A role of unpaired valance electrons is that they
A. take part in the formation of different types of bonds.
B. keep the paired electrons separated to minimize interaction.
C. are the nonbonding electrons.
D. tell us which Lewis dot structure is correct.
E. provide the number of Lewis dots.
Answer: A
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The famed Leaning Tower of Pisa doesn't tip over because its center of gravity is
A. displaced from its center. B. above support base. C. relatively low. D. stabilized by its structure.
Why do felsic rocks typically have the lightest color?
A) They contain olivine and pyroxene. B) They contain pyroxene, amphibole, and plagioclase feldspar. C) They contain quartz, mica, amphibole, sodium-rich plagioclase feldspar, and potassium feldspar. D) They contain olivine, pyroxene, and calcium-rich plagioclase feldspar.
What percentage of all antibiotics used in the United States are added to animal feed?
A. 20% B. 40% C. 50% D. 60% E. 80%
For a radioactive isotope like Uranium-235, what does the 235 indicate?
What will be an ideal response?