My Element Tile is going to be about Potassium, 19k. Elemental potassium is a soft silvery-white Alkali metal that oxidizes rapidly in air and is very reactive with water, generating sufficient heat to ignite the hydrogen emitted in the reaction and burning with a lilac flame. Naturally occurring potassium is composed of three isotopes, one of which, 40K, is radioactive. Traces (0.012%) of this isotope are found in all potassium, making 40K the most common radioisotope in the human body and in many biological materials, as well as in common building substances such as concrete. This is a really cool element tile hope you like it!!!!