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Periodic Table Atoms

PT and counting atoms

QuestionAnswer
atom The smallest particle into which an element can be divided and still have the properties of that element.
proton A positively – charged particle that is located in the nucleus of an atom.
neutron A particle with no charge that is located in the nucleus of the atom.
electron A negatively – charged particle that is located outside of the nucleus of the atom.
nucleus The center of an atom, containing the protons and neutrons.
electron cloud The region inside an atom where electrons may be found.
valence electrons The electrons in the outermost energy level of an atom.
atomic number The number of protons in the nucleus of an atom.
atomic mass The average mass of one atom of an element.
compound A substance made of two or more elements that are chemically combined.
Periodic Table of Elements A chart where all of the elements are arranged according to their atomic number and properties.
group/families A vertical column of elements on the periodic table. Shows number of valence electrons.
period A horizontal row of elements on the periodic table. Shows number of shells/energy levels.
physical property A property of a substance that can be observed without changing the identity of the matter.
chemical property A property of a substance that is based on its ability to react with another substance.
metal An element that is shiny, ductile, malleable, and a good conductor.
nonmetal An element that is not shiny, ductile or malleable and is not a good conductor.
metalloid An element that has properties of both metals and nonmetals.
chemical reaction A change that takes place when two or more substances interact to form new substances.
chemical formula A description that uses numbers and element symbols to represent the atoms that make up a compound.
reactant A starting material in a chemical reaction.
product A substance formed from a chemical reaction.
matter Anything that has mass and takes up space.
molecule Two or more bonded atoms.
subscript The total number of atoms of an element in a chemical formula.
coefficient The total number of molecules of a chemical formula.
Created by: vdelag2