Unit 1: The Nature of Matter

Question	Answer
atom	the smallest unit of an element that maintains the chemical properties of that element
atomic mass	mass of an atom, in atomic mass units, located under element symbol
atomic number	number of protons in the nucleus
compound	a substance made of two or more atoms chemically combined
density	measure of the amount mass in a given volume
electron	negatively charged particle that lives outside of the nucleus
element	a substance that cannot be separated or broken down into simpler substances by physical or chemical means
mass	measure of the amount of matter in an object
matter	anything that has mass and takes up space
mixture	combination of 2 or more substances not chemically combined
molecule	the smallest part of a substance that keeps the chemical properties of that substance
neutron	neutrally charged particle in the center of the atom
nucleus	center of the atom, contains protons and neutrons
period	horizontal row of elements
periodic table of the elements	table that organizes all elements based on specific properties and characteristics
proton	positively charged particle in the center of the atom
volume	the amount of space an object takes up

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