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periodic table

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 that are outside the nucleus in the electron cloud
nucleus small, dense, center that has a positive charge and is surrounded by moving electrons
proton positively charged particles in the nucleus
neutron particles in the nucleus that have no charge
electron cloud area around the nucleus in which electrons move
atomic number the number of protons in the nucleus of an atom
mass number total number of protons and neutrons in an atom's nucleus
periodic table an arrangement of the elements in order from increasing atomic mass
average atomic mass the average of the masses of all the naturally occurring isotopes of that element
metalloid elements that have some properties of metals and some properties of nonmetals
chemical symbol an abbreviation of the element where the first letter is always capitalized and all other letters are lower case
metal elements that are shiny, and conduct heat and electricity well, malleable, and ductile
group vertical column of elements that have similar physical and chemical properties
nonmetal elements that are poor conductors, dull, and brittle
period horizontal row of elements
chemical bond interactions that holds atoms or ions together
valence electron electrons found in the outermost energy level
ion a particle with a positive or negative charge
ionic bond force that brings oppositely charged ions together: metal and nonmetal
covalent bond atoms share one or more pairs of electrons: nonmetals
molecule group of atoms held together by chemical bonds
metallic bond formed between metal atoms when their outermost energy levels overlap
Created by: dschlake