click below
click below
Normal Size Small Size show me how
Periodic Table
8th Grade Periodic Table
Term | Definition |
---|---|
Period | The horizontal rows on the periodic table. Elements in the same row have the same number of electron shells/energy levels. |
Family/Group | The vertical columns on the periodic table. Elements in the same group/family have the same number of valence electrons. (Except Helium which is in Group 8, but only has 2 valence electrons. |
Metals | Are good conductors of electric current and heat. -Malleable -Ductile -Metallic luster -Solid at room temperature |
Malleable | Capable of being shaped. Easy to shape or bend. |
Ductile | Describes a material that can be pulled out into a long wire. |
Alkali Metals | The elements in Group 1A of the periodic table (except Hydrogen). VIOLENTLY REACT with water, and produce alkaline (basic) substance. |
Alkali Earth Metals | The elements in Group 2A of the periodic table. Shiny, Silvery-white Very reactive |
Transition Metals | Group B elements Form a bridge between the elements of the left and right sides of the Periodic Table (middle of the table). -Non-reactive metals. -Less predictable than other elements. |
Metalloids | Elements that have properties of both metals and nonmetals. |
Non-metals | -Brittle when solid -Dull -Poor conductors -Lower melting and boiling points than metals |
Halogens | The elements in Group 7A of the periodic table. -Very reactive -Poisonous -Bleaches and disinfectants |
Noble Gases | The elements in group 8A of the periodic table. -Colorless -Odorless -Extremely NONREACTIVE |