BBC
Bbc: Gcse Bitesize: What Does the Periodic Table Tell Us About the Elements?
The number of protons in the atom of an element determines its place in the Periodic Table. The number of electrons in an atom is the same as the number of protons. These electrons are arranged in shells or 'energy levels' around the...
BBC
Bbc: Gcse Bitesize: What Does the Periodic Table Tell Us About the Elements?
The elements in Group 7 of the Periodic Table are called the halogens. They include chlorine, bromine and iodine. Learn about their properties and uses, then take a quiz.