The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by ...

Author Question: The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by ... (Read 37 times)

tatyanajohnson

Hero Member
Posts: 569

on: Jul 28, 2018

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

Sr. Member
Posts: 342

Reply #1 on: Jul 28, 2018

Answer to Question 1

d

Answer to Question 2

b

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tatyanajohnson

Hero Member
Posts: 569

Reply #2 on: Jul 28, 2018

Thank you!

isabelt_18

Sr. Member
Posts: 342

Reply #3 on: Jul 28, 2018

Always glad to help...

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