118 Elements and Their Symbols and Atomic Numbers: The periodic table is a well-organized chart that contains all the known elements in the universe.These elements are building blocks of matter ...

This symbol shows that chlorine has 35 particles ... The relative charge of a nucleus is the same as its proton (atomic) number. Key fact: isotopes are forms of an element that have the same ...

Mr Holtom has been honoured with a blue plaque on the wall of Hillside Street in Hythe where he lived for over 20 years, from 1962 until his death in 1985. Campaigners said Mr Holtom's legacy is "part ...