Plz ! i will give brainliest! which of the following is true about an atom of iron and an atom of copper? a. they have different masses. b. both have the same properties. c. they have an equal number of protons. d. both have different types of sub-atomic particles.

your answer would be a. 12.5 kg

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.