6The Periodic TableOriginally created by Demitri Mendeleev we will cover that tomorrow.The periodic table is organized into a grid with groups and periods.Each element is represented by an element box containing the element’s name, symbol, atomic mass, & atomic number.
7PeriodsRows = periods (b/c trends in properties repeat – they’re “periodic” – as you go across the rows)
8What’s a periodic trend? Here’s an everyday example:
9Groups/FamiliesColumns = families or groups (b/c they have similar characteristics)
10Horizontal rows are called PERIODS Periodic tableMendeleevThe periodic table arranges all the elements in groups according to their properties.Vertical columns are called GROUPSHorizontal rows are called PERIODS
11Learning Check 1 Which element is in group 1, period 4? A) Be B) Ca D) C
12Learning Check 2 Which element is in group 14, period 3? A) Ge B) Na C) CD) Si
13Parts of the Periodic Table The periodic table is divided into several sections.The three main divisions are:MetalsMetalloidsNon-metalsWithin those sections we divide it even further.
15Metals On the left (EXCEPT H!) Metallic properties: Dense solids Shiny lusterHigh melting pointsTend to form positive ionsGood conductors of electricityMalleable (can stretch into wire)Ductile (can beat into sheets)
17Nonmetals On the right (AND hydrogen!) Properties: Low melting points Low densitiesDull lusterPoor conductors of heat and electricityMany are gasses at room temperatureIf you forget which side is which, remember – Oxygen is NOT a metal.