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Unit 3 Elem Comp Rea

electron a particle with a negative electrical charge
nucleus the center of an atom, which contains most of the atom's mass
proton a positively charged particle inside an atom's nucleus
neutron a particle that is found in the nucleus of an atom and has no electrical charge
electron cloud an area where electrons, arranged in energy levels, travel around an atom's nucleus
element a pure substance that cannot be broken down into a simpler substance
atomic number the number of protons in an atom of an element
isotope one of two or more atoms of an element having the same number of protons, but a different number of neutrons
average atomic mass the average mass of the atoms of an element
periodic table a chart that shows the elements in order of increasing atomic number
compound a substance formed by the chemical combination of two or more elements
ion an atom that is positively or negatively charged because it has gained or lost electrons
ionic bond an attraction that holds oppositely charged ions close together
covalent bond a chemical bond that forms when atoms share electrons
exothermic reaction a chemical reaction that releases energy (makes it feel warmer)
endothermic reaction a chemical reaction that absorbs energy (makes it feel cooler)
rate of reaction the measure of how fast a chemcial reaction occurs
catalyst a substance that speeds up a chemical reaction but is not used up itself or permanently changed
absorbed to have occupied or filled (Internet)
absorption of heat energy energy from the environment surrounding the chemicals involved in an endothermic reaction that are being held within during the reaction (pg 163)
atom smallest particle of an element that still has the properties of that element
hydrogen bond bond formed between two or more hydrogen atoms (such as in water)
molecules a particle of matter that is made of two or more atoms that are joined together (pg 53)
particle size measurement used to compare parts of solids, liquids, or gases (Internet)
powdered vs. solid forms materials in solid form hold their shape, when in powdered form they are in smaller pieces of the same material; more surface area is exposed when in powdered form (Internet)
replicate atomic structure create a copy of the make-up of atoms and molecules for a particular object (Internet)
Created by: akguidry