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Unit 3, Lesson 1&2

Atoms and the Periodic Table

TermDefinition
Atom The smallest unit of an element that maintains the properties of that element.
Electron A subatomic particle that has a negative charge.
Nucleus In physical science, an atom's central region, which is made up of protons and neutrons.
Proton A subatomic particle that has a positive charge and that is located in the nucleus of am atom; the number of protons in the nucleus it the atomic number, which determines the identity of the element.
Neutron A subatomic particle that has no charge and that is located in the nucleus of an atom.
Electron Cloud A region around the nucleus of an atom where electrons are likely to be found.
Atomic Number The number of protons in the nucleus of an toms: the atomic number is the same for all the atoms of an element.
Mass Number The sum of the numbers of protons and neutrons in the nucleus of an atom.
Periodic Table An arrangement of the elements in order of their atomic number such that elements with similar properties fall in the same column or group.
Chemical Symbol A one-, two-, or three-letter abbreviation of the name of an element.
Average Atomic Mass The weighted average of the masses of all naturally occurring isotopes of an element.
Metal An element that is shiny and conducts heat and electricity well.
Nonmetal An element that conducts heat and electricity poorly.
Metalloid An element that has properties of both metals and non metals.
Group A vertical column of elements in the periodic table; elements in a group share the same chemical properties.
Period In chemistry, a horizontal row of elements in the periodic table.
Created by: 18kmenning1211