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Chapter 4
Elements and the Periodic Table
42
Science
8th Grade
10/18/2010

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Term
Chapter 4 Section 1
Definition
Key Terms:
Atom Electron Nucleus Proton
Energy Level Neutron Atomic Number
Isotope Mass Number
Term
Atom
Definition
Is the smallest part of an element.
Term
Electron
Definition
A negatively charged particle that is found outside the nucleus of an atom.
Term
Nucleus
Definition
The central core of an atom;the solid inner core of a comet.
Term
Proton
Definition
A positively charged particle that is part of an atom's nucleus.
Term
Energy Level
Definition
The specific amount of energy an electron has.
Term
Neutron
Definition
A small particle in the nuclues of the atom, with no electrical charge.
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom. (Atomic________)
Term
Isotope
Definition
An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
Term
Mass Number
Definition
The sum of protons and neutrons in the nucleus of an atom.
Term
Chapter 4 Section 2
Definition
Key Words:
Atomic Mass Periodic Table Period
Group Chemical Symbol
Term
Atomic Mass
Definition
The average mass of all the isotopes of an element.
Term
Periodic Table
Definition
A chart of the elements showing the repeating pattern of their properties.
Term
Period
Definition
A horizontal row of elements in the periodic table.
Term
Group
Definition
Elements in the same vertical column of the periodic table; also called a family.
Term
Chemical Symbol
Definition
A one- or two-letter representation of an element.
Term
Chapter 4 Section 3
Definition
Key Words:
Metal Malleable Ductile Thermal Conductivity
Electrical Conductivity Reactivity
Corrosion Alkali Metal
Alkaline Earth Metal Transition Metal
Particle Accelerator
Term
Metal
Definition
A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity.
Term
Malleable
Definition
A term used to describe material that can be pounded into shapes.
Term
Ductile
Definition
A term used to describe a material that can be pulled out into a long wire.
Term
Thermal Conductivity
Definition
The ability of an object to transfer heat.
Term
Electrical Conductivity
Definition
The ability of an object to transfer electric current.
Term
Reactivity
Definition
The ease and speed with which an element combines, or reacts, with other elements and compounds.
Term
Corrosion
Definition
The gradual wearing away of a metal element due to a chemical reaction.
Term
Alkali Metal
Definition
An element in Group 1 of the periodic table.
Term
Alkaline Earth Metal
Definition
An element in Group 2 of the periodic table.
Term
Transition Metal
Definition
One of the elements in Groups 3 through 12 of the periodic table.
Term
Particle Accelerator
Definition
A machine that moves atomic nuclei at higher and higher speeds until they crash into one another, sometimes forming heavier elements.
Term
Chaper 4 Section 4
Definition
Key Words:
Nonmetal Diatomic Molecule Halogen
Inert Gas Semimetal Semiconductor
Term
Nonmetal
Definition
An element that lacks most of the properties of a metal.
Term
Diatomic Moleclule
Definition
A molecule consisting of two atoms.
Term
Halogen
Definition
An element found in Group 17 of the periodic table.
Term
Inert Gas
Definition
An element found in Group 18 of the periodic table.
Term
Semimetal
Definition
An element that has some characteristics of both metals and nonmetals. (One___)
Term
Semiconductor
Definition
A material that conducts current under certain conditions. (One___)
Term
Chapter 4 Section 5
Definition
Key Words:
Radioactive Decay Radioactivity
Alpha Particle Beta Particle
Gamma Radiation Tracer
Term
Radioactive Decay
Definition
The process in which the atomic nuclei of unstable isotopes release fast-moving particles and energy.
Term
Radioactivity
Definition
The ability of a substance to spontaneously emit radiation; a property of unstable isotopes.
Term
Alpha Particle
Definition
A type of nuclear radiation consisting of two protons and two neutrons.
Term
Beta Particle
Definition
A fast-moving electron that is given off as nuclear radiation.
Term
Gamma Radiation
Definition
A type of nuclear radiation made of high-energy waves.
Term
Tracer
Definition
A radioactive isotope that can be followed through the steps of a chemical reaction or industrial process.
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