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Periodic Table

the basic particle of which all elements are made; the smallest particle of an element that has the properties of that element. atom
a tiny, negatively charged particle that moves around the outside of the nucleus of an atom. electrons
the central core of an atom which contains protons and neutrons. nucleus
small, positively charged particles that are found in the nucleus of an atom. protons
a region of an atom electrons of the same energy are likely to be found. energy level
a small particle in the nucleus of an atom, no electrical charge. neutron
the number of protons in the nucleus in an atom. atomic number
an atom with the same number of protons an a different number of neutrons form other atoms of the same element. isotopes
the sum of protons and neutrons in the nucleus of an atom. mass number
the number of protons in the nucleus of an atom. atomic number
an arrangement of the elements showing the repeating pattern of their properties. periodic table
a 1 or 2 letter representation of an element. chemical symbol
a horizontal row of elements in the periodic table. period
elements in the same vertical column of the periodic table; also called family. group
a class of elements characterized by physical properties that include luster, malleability, ductility, and conductivity. metal
the way a mineral reflects light from its surface. luster
a term used to describe material that can be hammered or rolled into flat sheets. malleable
a term used to describe a material that can be pulled out into a long wire. ductile
the ability of an object tot transfer heat. thermal conductivity
the ability of an object to carry electric current. electrical conductivity
the ease and speed with which an element combines, or reacts, with other elements and compounds. reactivity
the gradual wearing away of a metal element due to a chemical reaction. corrosion
an element in group 1 in the periodic table. alkali metal
an element in group 2 in the period table. alkaline earth metal
one of the elements in groups 3-12 on the periodic table. transition metal
an element that lacks most of the properties of a metal. nonmetal
a molecule consisting of 2 atoms. diatomic metal
an element found in group 17 on the periodic table. halogen
an element in group 18 of the periodic table. noble gasses
an element that has some characteristics of both metal and nonmetals. metalloid
a substance that can conduct electric current under some conditions. semiconductor
the process in which radioactive elements break down, releasing fast moving particles and energy. radioactive decay
a reaction involving the particles in the nucleus of an atom that can change one element into another. nuclear reaction
the spontaneous emission of radiation by ab unstable atomic nucleus. radioactivity
a particle given off during radioactive decay tat consists of of 2 protons and 2 neutrons. alpha particle
a fast moving electron that is given of as nuclear radiation. beta particle
electromagnetic waves with the shortest wavelengths and highest frequencies. gamma ray
the time it takes for half of the atoms of a radioactive element to decay. half life
the process of determining the age of an object using half life of 1 or more radioactive isotopes. radioactive dating
a radioactive isotope that can be followed through the steps of a chemical reaction or industrial process. tracer
Created by: elcamino504