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Chapter 5 periodic Table

Terms in this set (28)

Mendeleev arranged the elements into rows in order of increasing mass so that elements with similiar properties were in the same coumn.
How did Mendeleev's arrange the elements in the peridoic table?
Periodic Table
An arrangement of elements in columns, based on set of properties that repeat from row to row.
The close match between Mendeleev's predictions and the actual properties of new elements showed how useful his predictions could be.
How did the discovery of new elements such as gallium demonstrate the usefulness of Mendeleevs's table?
Period
Each row in the table of elements.
Group
Each column on the periodic table.
Periodic Law
The pattern of repeating properties displayed by elements in the peridoic table.
Atomic mass unit (amu)
One twelth the mass of a carbon-12 atom.
Metal
Elements that are good conductors of electric current and heat.
Transition metals
elements that form a bridge between the elements on the left and right sides of the table.
Nonmetals
elements that are poor conductors of heat and electric current.
Metalloids
elements with properties that fall between those of metals and nonmetals.
In the modern periodic table the elements are arranged by increasing atomic number(number of protons).
What determinnes the order of the elements in the modern periodic table?
Properties of elements repeat in a predictable way when atomic numbers are used to arrange elements into groups.
.Describe the periodic table.
Atomic mass is a value that depends on the distribution of an element's isotopes in nature and the masses of thosose isotopes.
What two factors determine the atomic mass of an element?
Name three that are used to classify the elements in the periodic table.
Elements are classified as metals, nonmetals, and metalloiods.
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