Nomenclature

History of Chemistry Middle Ages – people believed there were only 4 elements: Water Air Fire Earth (WAFE – to remember this)

Naming & Classifying H – Hydrogen He – Helium Pb – Lead Au - Gold Berzelius - created a better system for symbols: Dalton: Berzelius: H – Hydrogen He – Helium Pb – Lead Au - Gold

Naming & Classifying Rules for symbols: 1 - first letter of the name of element written in a CAPITAL letter. ex - Hydrogen ---- H 2 - if the letter is already used add the second letter but in lower case. ex - Helium ---- He 3 - often the Latin name is used rather than the English name; ex - silver ---- argentum - Ag

Ordering Elements Non-metals Metals All elements are ordered - Periodic Table: Metals Non-metals

Ordering Elements All elements are ordered ---- Periodic Table: Periods: - rows - become less metallic from left to right - atomic mass generally increases from left to right - atomic number increases from left to right

Nomenclature Go to Naming Compounds