Which of these is not an event that make the moon as it is today?
a. iron sank into earth's core.
b. plate tectonics caused lava to flow.
c. earth and a planetesimal collided.
d. the lunar surface melted and was bombarded by meteoroids

The correct answer to the question that is stated above is letter b, Plate tectonics caused lava to flow. All of the options are mentioned in the theories of the formation of the moon except for letter B.

There are 5 serious  theories about the formation of the moon,these are:
The Fission Theory--
The Capture Theory--
The Condensation Theory--
The Colliding Planetesimals Theory--
The Ejected Ring Theory--

See attached file for the description of each theory.

It won't lose or gain electrons if it's a covalent bond it shares the electrons with another atom or atoms. if it is an ionic bond it will lose the 3 electrons on the outer shell and become a positively charged ion.  credit goes to @sunshinebaby of answers.yahoo.com.

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