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Unit 3

Atoms and the Periodic Table

TermDefinition
atom the smallest particle into which an element can be divided and still be the same element
electron negatively charged particles
nucleus a small, dense center that has a positive charge and is surrounded be moving electrons
proton positively charged particles in the nusleus
nuetron uncharged particles in the nucleus
electron cloud the area around the nucleus in which the particles move
atomic number the number of protons in the nucleus of an atom
mass number the total number of protons and neutrons in an atoms nucleus
periodic table Dmitri Mendeleev's arrangement of the elements
chemical symbol an abbreviation for the elements name
average atomic mass the weighted average of the masses of all the naturally occurring isotopes of that element
metal elements that are shiny and conduct heat and electricity well
nonmetal poor conductors of heat and electricity
metalloid elements that have some properties of metals and some properties of nonmetals
group each vertical column on the periodic table
period each horizontal row of elements of the periodic table
Created by: 18boller0315
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