Flash Cards

Properties and Structure of Matter

Term Definition
matter anything that has mass and takes up space
mass a measure of the amount of matter in an object
volume a measure of how much space an object takes up
weight the force of gravity between Earth and an object
density a measure of how tightly packed the matter in an object is
conduct to allow energy to flow through materials easily
insulate to prevent heat from passing through
element a pure substance that cannot be broken down into any simpler substances
compound any substance that is formed by the chemical combination of two or more elements and acts like a single substance
atom the smallest unit of an element that retains the properties of that element
proton a particle in the nucleus of an atom that carries one unit of positive electric charge
neutron a particle in the nucleus of an atom that has no net electric charge
electron a particle in the space outside the nucleus of an atom that carries one unit of negative electric charge
nucleus an atom's dense center, where most of its mass is
molecule a particle that contains more than one atom joined together


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