What is the half-life of chromium-56 if 13.2 minutes are required for the activity of a sample of chromium-56 to fall to 21.2 percent of its original value?

How do scientists think that gravity affected the formation of our solar system?

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

Name the element in group 17, period 2. (periodic table)