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7-PS1-1 (Matter)

Atomic Structure & Matter

TermDefinition
atom The smallest unit of an element that makes up all matter.
nucleus The center of an atom made up of protons and neutrons.
electron The negatively charged subatomic particle of an atom found outside the nucleus.
proton The positively charged subatomic particle of an atom.
neutron The neutral (0) charged subatomic particle of an atom.
element A pure substance made up of one kind of atom. It can’t be changed into simpler substances.
compound A pure substance made up of two or more different atoms that are chemically combined.
molecule The smallest unit of a compound made up of two or more atoms that are chemically combined.
monatomic molecule A molecule composed of only one atom or element. They include atoms/elements that belong to noble gases.
diatomic molecule Molecules that are composed of only two of the same atom or element. These atoms/elements are both nonmetals.
extended structures Are created by ionic compounds that join to form large repeated patterns or chains of molecules.
crystals Solid structures whose atoms are arranged in a regular grid pattern.
matter Any substance that has mass and takes up space.
pure substance A substance made up of only one type of atom (element) or two or more different kinds of atoms (compounds).
Homogeneous mixture Type of mixture that is uniformly “evenly” mixed. Is also known as a solution.
Heterogeneous mixture Type of mixture that is not uniformly “not evenly” mixed.
solution A mixture in which one substance is dissolved in another. It also contains a solvent and at least one solute.
solute The part of the solution that is dissolved by a solvent.
solvent The part of a solution that dissolves the solute and is usually present in the largest amount.
Created by: Westview7G
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