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Chapter 17

Atoms

TermDefinition
Atom The smallest piece of matter that still retains the property of the element.
Atomic Number The number of protons in an atom is equal to a number.
Average Atomic Mass The weighted average mass of the mixture of an element's isotopes.
Electron Particles with an electrical charge of 1+.
Electron Cloud The area around the nucleus of an atom where its electrons are most likely found.
Electron Dot Diagram Uses the symbol of the element and dots to represent the electrons in the outer energy level
Groups The vertical columns in the periodic table; also called families.
Isotopes Atoms of the same element that have different numbers of neutrons.
mass number Sum of the number of protons and neutrons in an atom's nucleus.
neutron Neutral particle, composed of quarks, inside the nucleus of an atom.
nucleus Positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons.
period Horizontal row in the periodic table. The amount of time it takes one wavelength to pass a fixed point; is expressed in seconds.
periodic table Organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties.
proton Particle, composed of quarks, inside the nucleus of an atom that has a charge of 1+.
quark Particles of matter that make up protons and neutrons.
Created by: Christopher H.