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unit 3, lesson 1&2


atom the smallest particle into which an element can be divided and still be the same element
electron negatively charged particles that are found in the atom
nucleus a small, dense center that has a positive charge and is surrounded by moving electrons
proton the positively charged particles in the nucleus
neutron uncharged particles in the nucleus
electron cloud electrons move within an area around the nucleus
atomic number number of protons in the nucleus of an atom
mass number total number of portions and neutrons in an atom's nucleus
periodic table arrangement of he elements
chemical symbol abbreviation for the element's name
average atomic mass the weighted average of the masses of all the naturally ouccurring
metals elements that are shiny and conduct heat and electricity well
nonmetals poor conductors of heat and electricity
metalloids elements that have some properties of metals and some properties of nonmetals
group vertical column of elements with similar properties together
period horizontal row of elements on the periodic table
Created by: 18ldavis0806