The group of elements that tend to be found as toxic gases or liquids in their pure form including chlorine, bromine and iodine are called alkali metals true or false

it should be all of them because it asks if you included all of those in your answer

explanation:

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.