Elements on the right side of the periodic table differ from the elements on the left side in that the elements on the right side Select One:
A) are solid at room temperature.
B) tend to form ions by gaining electrons.
C) are good electrical conductors.
D) generally have very high densities.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

20 drops hope this