periodic table, A chart that organizes all chemical elements according to their properties., chemical element, A pure substance made of only one type of atom., atomic number, The number of protons in the nucleus of an atom., atomic mass, The average mass of an atom of an element., chemical symbol, A one- or two-letter abbreviation representing an element., element box, A box in the periodic table that shows information about one element., period, A horizontal row of elements in the periodic table., group, A vertical column of elements with similar properties., electron shell, A region around the nucleus where electrons are found., electron configuration, The arrangement of electrons in an atom., chemical property, A characteristic that describes how a substance reacts chemically., valence electron, An electron in the outermost shell of an atom., metal, An element that is usually shiny, conducts heat and electricity, and is malleable., non-metal, An element that does not have the typical properties of a metal., noble gas, A group of gases that are very stable and rarely react with other elements., block, A section of the periodic table based on electron configurations (s, p, d, or f)., nuclear charge, The positive charge of an atom's nucleus, equal to the number of protons., arrange, To put things in a particular order or pattern., classify, To organize things into groups based on shared characteristics., predict, To say what is likely to happen or exist based on evidence.

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