click below
click below
Normal Size Small Size show me how
Genesis Brown
Chapter 5 vocab.
Term | Definition |
---|---|
Period | Each row in the table of elements. |
Group | Each column on the periodic table. |
Periodic Law | Pattern of repeating properties. |
Atomic Mass Unit (amu) | Defined as one twelfth the mass of a carbon-12 atom. |
Metals | Elements that are good conductors of electric current and heat. |
Transition Metals | Elements that form a bridge between the elements on the right and left sides of the periodic table. |
Nonmetals | Elements that are poor conductors of heat and electric current. |
Metalloids | Elements with properties that fall between those of metals and nonmetals. |
Valence Electron | An electron that is at the highest energy level of an atom. |
Alkali Metals | Elements in group 1A. Single valence electron and are very reactive. |
Alkaline Earth Metals | Elements in group 2A. Two valence electrons. |
Halogens | Elements in group 7A. Seven valence electrons. |
Noble Gases | Elements in group 8A. Helium has two valence electrons, the other noble gases have eight valence electrons. |
Periodic Table | An arrangement of elements in columns, based on a set of properties that repeat from row to row. |