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20 Cards in this Set

  • Front
  • Back
Atomic Mass
The average mass of all the isotopes of an element. Can be found below the element' s name on the periodic table.
Chemical Symbol
A one or two letter representation of an element.
Group
Elements in the same vertical column of the periodic table; also called family. The elements in each group share the same characteristics and the same number of valence electrons.
Periodic Table
An arrangement of elements showing the repeating patter of their properties.
Period
A horizontal row of elements in the periodic table. Elements in the same period have the same number of electron shells.
Metals
A class of elements characterized by physical and chemical properties that include shininess, malleability, and conductivity.
Nonmetals
An element that lacks the properties of a metal.
Metalloids
An element that has some characteristics of both metals and nonmetals.
Noble Gas
An element found in Group 18 of the periodic table.
Halogen
An element found in Group 17 of the periodic table.
Family
Elements in the same vertical column of the periodic table; also called a group. The elements in each family share the same characteristics and the same number of valence electrons.
Density
The ratio of the mass of a substance to its volume. (mass divided by volume).
Dmitri Mendeleev
He created the first periodic table. Mendeleev arranged the elements in order of increasing atomic mass. He even predicted elements that would be discovered in the future.
Reactivity
The ease and speed with which an element combines or reacts with other elements.
Properties
The things that distinguish the differences between elements. These can be physical like boiling and melting point or chemical like an elements re-activity.
Ductile
The ability of a material to be easily drawn into the shape of a wire.
Conductivity
The ability of an element or material to transfer heat or electricity.
Malleable
Used to describe material that can be hammered or rolled into sheets.
Valence Electrons
The electrons that are most loosely held by the atom and the ones that are involved in chemical reactions. Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms’ valence electrons
Chemical Reaction
Chemical reactions occur whenever valence electrons are shared or transferred between atoms.