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Unit B


Gas A state of matter where the atoms or molecules are farther apart than in a liquid and moving faster than a liquid, very little or no attraction between particles.
Liquid A state of matter where the atoms or molecules are packed less closely than a solid but more closely than a gas and are moving more than a solid; some attraction between the particles.
Solid A state of matter where the atoms or molecules are packed closely together and do not move freely; strong attraction between the particles.
Molecule Smallest part of a compound with the properties of that compound; tow or more atoms chemically bonded together.
Particle Atoms or molecules of a substance; compose all matter and are in constant motion.
State of Matter
Atom Smallest part of an element with the properties of that element; basic building blocks (basic structural unit) of all matter.
Atomic Mass
Mass Number The total number of protons and neutrons in one atom of a element.
Atomic Number The number of protons in one atom of an element, is used to identify the element.
Electron A negatively charged particle found outside the nucleus of an atom. 1/2000 a proton.
Electron Cloud The area surrounding the nucleus of an atom where electrons orbit.
Neutron A particle, same mass as a proton, but with no electric charge, found in the nucleus of the atom.
Nucleus The center of an atom where protons and neutrons are found.
Proton Positively charged particle, found in the nucleus of an atom; quantity is equal to the atomic number/ determine the element.
Element Is a substance that can not be broken down into simpler substances by heating it or causing it to react with other chemicals.
Family (of Elements)
Periodic Table of the Elements
Created by: 3zimm