OUTLINE History of Periodic Table Periodic Table Organization

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1 THE PERIODIC TABLE

2 OUTLINE History of Periodic Table Periodic Table Organization Period Group/Family Representative Elements Transition Elements Inner Transition Elements

3 OUTLINE Types of Elements Metals Nonmetals Metalloids

4 HISTORY OF PERIODIC TABLE By the Mid-1800s, there were 65 known elements. Scientists began to recognize patterns after recording information such as: chemical reactivity (ex: bonding patterns) physical properties (ex: state of matter, mass)

5 HISTORY... DMITRI MENDELEEV ( ) Wrote out elements in order of increasing ATOMIC MASS, and ended up with a table! Now organized according to: ATOMIC NUMBER NUMBER OF ELECTRONS Why PERIODIC? Periodic means repeating patterns and properties.

6 PERIODIC TABLE ORGANIZATION The periodic table is arranged in rows and columns. PERIOD Horizontal rows on table 7 in total Atomic Mass and Atomic Number increase from LEFT TO RIGHT

7 ORGANIZATION... GROUP Also known as FAMILY Vertical columns on table Elements of the same group have similar but not identical properties.

8 ORGANIZATION... There are two number systems for groups: CURRENT:1-18 OLD: ROMAN NUMERALS IA VIIIA IB - VIIIB

9 ORGANIZATION... GROUP 1 Alkali Metals Soft, silver, react violently with water GROUP 2 Alkaline Earth Metals Shiny, silver, light, reactive GROUP 17 Halogens Extremely reactive, poisonous GROUP 18 Noble Gases INERT Not reactive under normal laboratory conditions

10 ALKALI METALS A video of alkali metals reacting with water

11 ORGANIZATION...

12 ORGANIZATION... REPRESENTATIVE ELEMENTS AKA Group A elements Groups IA-VIIIA, or 1, 2, These elements illustrate the ENTIRE RANGE OF PROPERTIES OF ELEMENTS.

13 ORGANIZATION... TRANSITION ELEMENTS AKA Group B elements Group IB-VIIIB, or the lower groups Metallic elements that exhibit some different properties due to their electron arrangements.

14 ORGANIZATION... INNER TRANSITION ELEMENTS Removed from the main table as a matter of convenience in organizing table Two names: LANTHANIDES (rare earth) ACTINIDES (radioactive)

15 TYPES OF ELEMENTS

16 TYPES OF ELEMENTS There are three types of elements on the periodic table: Metals Nonmetals Metalloids/Semi-Metals The STAIRCASE LINE on the periodic table divides the METALS and the NONMETALS. The ratio of metals to nonmetals is about 4:1.

17 METALS Substances found on the Left Hand Side of the staircase on the periodic table. Physical properties include: Shiny Solids at room temperature (except Hg) Good conductors of electricity Ductile (can be stretched into wire) Malleable (can be hammered in shapes)

18 NON-METALS Substances found on the Right Hand Side of the staircase on the periodic table. Physical properties include: Dull Brittle S, L, or G at room temperature Poor conductors/good insulators

19 METALLOIDS AKA semi-metals Substances that are found ON the staircase on the periodic table. Have properties of BOTH metals and nonmetals. In general, Hard, but sometimes brittle Solid High melting points Weak (or not at all) conductors of electricity

20 HYDROGEN The rebel of the periodic table! It does not really belong anywhere. Hydrogen is usually located on the top left hand corner of the table, even though it has both metallic and nonmetallic properties.

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