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Periodic Table

Elements and the Periodic Table - Majeski

TermDefinition
atomic mass the average mass of all the isotopes of an element
periodic table a chart of the elements showing the repeating pattern of their properties
chemical symbol a one- or two-letter representation of an element
period a horizontal row of elements on the periodic table - have properties that change in pattern
groups elements in the same vertical column of the periodic table; also called a family
nucleus very small center core of an atom
proton particle in the nucleus with a positive charge
neutron particle of an atom with no charge or neutral charge
electron rapidly moving particle in the nucleus with a negative charge
atomic number number of protons in the nucleus of an element
isotope atoms with the same number of protons but different number of neutrons
mass number total sum of protons and neutrons in the nucleus of an atom
model diagram, picture, mathematical statement, or object that helps to explain the natural world (things too small, too large, too slow, too fast, too far away)
metal objects that are shiny, malleable, ductile, and/or conduct electricity
malleable object that can be hammered or rolled into flat sheets or other shapes
ductile material that can be pulled out, or drawn, into long wire
conductivity ability of an object to transfer heat or electricity
reactivity ease and speed with which an element combines, or reacts, with other elements and compounds - decreases in elements moving from left to right across the periodic table
corrosion destruction of a metal through reaction with air or water
alkali metal
alkaline earth metal elements that are fairly hard, gray-white, good conductors of electricity - 2 most common = calcium and magnesium
transition metal elements that are hard, shiny, good conductors of electricity but less reactive than metals - gold, silver, copper, nickel
alloy mixture of a metal with at least one other element
particle accelerator powerful machine used to make synthetic elements
lanthanides soft, malleable, shiny metals with high conductivity
semiconductor substance that will conduct electricity only under certain conditions
gases state of most nonmetals
nonmetals poor conductors of electricity - elements to the right of metalloids on the periodic table
family column of elements
Dmitri Mendeleev organizer of the first truly useful periodic table with elements in order of atomic mass
metalloids element that shares characteristics of metals and nonmetals
halogens family that includes fluorine, chlorine, bromine, and iodine
noble gases elements that do not ordinarily form compounds
Created by: lindakelly