7P2A.2 Obtain and use information about elements (including chemical symbol, atomic number, atomic mass, and group/family) to describe the organization.

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Presentation transcript:

7P2A.2 Obtain and use information about elements (including chemical symbol, atomic number, atomic mass, and group/family) to describe the organization of the periodic table

The Periodic Table What does it do? Organize all the elements It is organized by atomic numbers. Every periodic table will have a square for each element with the Element name Chemical/element symbol Atomic number Atomic mass

Chemical/Element Symbols Each element has a different symbol Symbols are written with one, two, or three letters The first letter is always capitalized

Element Symbol Hydrogen H Silicon Si Carbon C Copper Cu Nitrogen N Aluminum Al Oxygen O Silver Ag Chlorine Cl Gold Au Magnesium Mg Iron Fe Zinc Zn Helium He Calcium Ca Potassium K Phosphorus P Sodium Na Iodine I Fluorine F

Atomic Number The atomic number of an element is equal to the number of protons The atomic number is a whole number The atomic number is always the same for a given element The elements on the periodic table are arranged numerically by increasing atomic number

Atomic mass The atomic mass is an average sum of the number of the protons and the number of neutrons in the nucleus of the atom Since the atomic mass of an element is an average, it is usually not a whole number

Period A horizontal row of the periodic table is called a period Think about this: What do you always end a statement with? Which way do you write a sentence, vertically or horizontally?

Families Families, also called GROUPS, are vertical columns of elements on the periodic table They are numbered 1-18 Elements in the same family have similar properties

Metalloids There is a zigzag line on the right side of the periodic table that separates the metals from the nonmetals. Metalloids are found along the zig zag line Elements identified as metalloids have properties (characteristics) of both metals and nonmetals

Metals Metals are generally located on the left side of the zig zag line Examples of metals are: Sodium (Na) Calcium (Ca) Iron (Fe) Aluminum (Al) The majority of elements are metals

Nonmetals Nonmetals, with the exception of Hydrogen (H), are located on the right side of the zig zag line on the periodic table. Examples of nonmetals are Chlorine (Cl) Oxygen (O) Sulfur (S) Iodine (I)

Chemical Formula Common name NaCl Table Salt H2O Water C6H12O6 Simple Sugar O2 Oxygen Gas CO2 Carbon Dioxide N2 Nitrogen Gas Fe2O3 Rust