What does the half-life of a radioisotope represent?

What must happen before a body cell can begin mitotic cell division

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus. b) the number of neutrons it contains in its nucleus. c) the number of protons it has in a cloud around the nucleus. d) the number of neutrons it has in a cloud around the nucleus. e) the number of electrons it exchanges with its neighbors.