Download 8.5C Vocabulary

8.5C
Periodic Table of Elements
Element
Atomic Symbol
Atomic Number
Atomic Mass / Mass #
amu
Periods
Groups
Electron Shell
Outermost Electron Shell
Valence Electrons
Metals
Non-Metals
Metalloids
Noble Gas
Reactivity
A table showing the chemical elements arranged according to their atomic numbers
A pure substance that cannot be separated into simpler substances by physical or chemical
means; made of atoms that have the same properties as the element.
A one or two letter notation used to represent an atom of a particular element
The number of protons in the nucleus of one atom of an element
The average mass of protons (P+) and neutrons (N0) in an element
Stands for Atomic Mass Unit; is used to indicate mass on an atomic or molecular scale One
proton (P+) has a mass of 1 amu one neutron (N0) has a mass of 1 amu.
The rows in a Periodic Table that classify the elements by the number of electron shells ………
The columns on a Periodic Table that arrange the elements by the number of electrons that are in
the outermost shell (valence electrons)
A specific area where electrons (e-) of the same energy level are found
Either filled or partially filled last energy level of an atom that determine the chemical properties of
the atom; it is called the valence shell
The electrons in the outermost energy level of an atom that influence how an element will react
with other substances
Most elements are metals. Properties include solid at room temperature, have a shiny luster,
malleable, and good conductors of heat and electricity
Elements on the right side of the Periodic Table; they tend gasses in their natural state, dull, brittle
(not malleable) and poor conductors of heat and electricity
Elements that have properties of both metals and nonmetals; sometimes referred to as
semiconductors
Unreactive nonmetals in Group 18 of the Periodic Table; they have a full valence shell
The rate at which a chemical substance tends to undergo a chemical reaction
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