440nm, 690nm, 490nm, 580nm which one would most likely be seen in red (wave length)

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.

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

What does the start look like