Author Question: The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by ... (Read 51 times)

tatyanajohnson

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The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by mass?
 a. 25
  b. 64
  c. 50
  d. 75

Question 2

If atoms unite by transfer of electrons, they form
 a. an organic compound.
  b. an ionic compound.
  c. a polar molecule.
  d. a covalent compound.



isabelt_18

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Answer to Question 1

d

Answer to Question 2

b



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