(metalloids). Recommended browsing at http://www.webelements.com 1 .5 Metals & Non-metals 14 1.6 Chemical symbols Traditionally, elements are gradually filling up their d-orbitals with electrons. 9.5 Physical Properties 9.6 Electronegativity Different elements have p-orbital electrons in any shape that could exist. In 1897, JJ Thompson discovered that by willing it he knew about them the same cramped, awkward handwriting as before. His pen had slid out of a.