Atoms, Elements, and the Periodic Table

charged particle that has more or fewer electrons than protons

positively charged center of an atom that has protons & neutrons and surrounded by electrons 

area around the nucleus of an atom where the atom's electrons are most likely found

atoms of the same element that have different numbers of neutrons

element that usually is a gas/brittle solid at room temperature; not ductile poor conductor 

Horizontal rows in the periodic table

pure substance that contains two or more elements

elements in groups 3-12 of the periodic table, occur in nature as uncombined elements

element that typically is a hard, shiny solid, is malleable, and is a good conductor of heat

element having characteristics of both metals and nonmetals

substance with atoms which are all alike

Electrons located in the outer energy level

symbol for an element and dots representing electrons in the elements outer energy level

neutral particle inside the nucleus of an atom

 list of all known elements that are arranged according to repeated changes in properties

positively charged particles inside the nucleus of an atom

weighted average mass of all the isotopes of an element

vertical column in the periodic table

negatively charged particles surrounding the center of an atom

sum of the number of protons and nuetrons in an atom's nucleus

The smallest particle of a substance that retains all of the properties of that substance

the number of protons in the nucleus of each atom of a given element; top number periodic table