Answer:
Caesium (55Cs) has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes. The atomic masses of these isotopes range from 112 to 151. Only one isotope, 133Cs, is stable. The longest-lived radioisotopes are 135Cs with a half-life of 2.3 million years, ... It constitutes most of the radioactivity still left from the Chernobyl accident ...
I am pretty sure the answer is . But I might be wrong.
Yes when a firework goes into the sky it releases chemical potential energy which is then changed into kinetic energy
The crust of the Earth is thickest beneath the continents.
