A velocity vs. time graph for an object is shown. Which parts of the graph represents the object moving
at a constant, positive acceleration?
Velocity vs Time
25
20
O W and X
O X and Y
O Y and Z
W and Z
Y
х
15
Velocity (m/s)
10
Z
N
5
w
2
4
5
3
Time (s)

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.

Because its reliable.   there is no pollution  the chances of a radiation leak is low