Which of the following is true about elements in the same horizontal row of the periodic table?
A) The number of valence electrons remains the same throughout the row.
B) The number of valence electrons decreases as we move left to right across a row.
C) The number of valence electrons increases as we move left to right across a row.
D) There is no simple relationship between the number of valence electrons and the position of the element.
C
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Full-cost pricing of gasoline refers to taxing gasoline by the gallon, as it is purchased, to cover the estimated harmful costs of driving. This tax has been estimated to be:
a. $2.90 per gallon b. $12.00 per gallon just for the tax c. $12.00 per gallon when combined with the cost of the gas itself d. $4.00 per gallon e. $4.00 per liter
What feature may form where a stream enters the relatively still waters of a lake, an inland sea, or the ocean?
What will be an ideal response?
Terrestrial ecosystems are most easily distinguished from one another by the ____ that are present in that system
a. autotrophs b. carnivores c. primary consumers d. decomposers e. nutrient cycles
Which of the following is true of thermohaline circulation?
A) They are deep currents caused by differences in temperature and salinity. B) The circulation has a definitive beginning and end, at the equator and poles, respectively. C) Due to t heir depths, they carry limited volumes of water. D) They travel at greater speeds than surface currents. E) They are largely wind driven.