Iodine Is a chemical element, symbolized as I and with the atomic number 53 . It 39;s a non-metallic halogen, crucial for ...

They will also be able to explain the meaning of atomic number and atomic mass. About this Lesson. Lessons 2 and 3 both use the 20 sheets of atom description cards – one sheet for each element.

AN important result of the development of Moseley's atomic number rule has been the impetus it has given to the search for missing elements. It is true that later arrangements of the Periodic ...