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Atom and PT

Chemistry: Atomic Structure & Periodic Table

TermDefinition
atom The smallest particle into which an element can be divided and still have the properties of that element.
proton A positively – charged particle that is located in the nucleus of an atom.
neutron A particle with no charge that is located in the nucleus of the atom.
electron A negatively – charged particle that is located outside of the nucleus of the atom.
nucleus The center of an atom, containing the protons and neutrons.
electron cloud The region inside an atom where electrons may be found.
energy level A specific area in an atom at a definite distance from the nucleus.
valence electrons The electrons in the outermost energy level of an atom.
atomic number The number of protons in the nucleus of an atom.
atomic mass The average mass of one atom of an element.
electric charge The sum of the charges within an atom.
Periodic Table of Elements A chart where all of the elements are arranged according to their atomic number and properties
group A vertical column of elements on the periodic table.
period A horizontal row of elements on the periodic table.
physical property A property of a substance that can be observed without changing the identity of the matter.
chemical property A property of a substance that is based on its ability to react with another substance.
metal An element that is shiny, ductile, malleable, and a good conductor.
nonmetal An element that is not shiny, ductile or malleable and is not a good conductor.
metalloid An element that has properties of both metals and nonmetals.
Created by: NEISDSci
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