Which of the following elements has the most valance electrons in its outermost shell?

A) carbon
B) nitrogen
C) oxygen
D) helium


Answer: C

Environmental & Atmospheric Sciences

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Who proposed the idea of seafloor spreading?

a. Harry Hess b. Frederick Vine c. Oliver and Sykes d. Fred Taylor e. Hess and Matthews

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Indicate whether the statement is true or false

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