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Ch. 7 and Ch. 8


Atom is the smallest piece of an element that still represents that element
Electrons is particle with one negative charge
Proton is an atomic particle that has one positive charge.
Neutron is a neutral particle that exists nucleus of atom
Nucleus most of an atoms mass and positive charge is concentrated in a small area in the center of an atom
Electron Cloud is an area around an atomic nucleus where an electron is most likely to be located.
Atomic number number of protons in an atom of an element.
Isotopes are atoms of the same element that have different numbers of neutrons. Most elements have several isotopes.
Mass Number s the sum of the number of protons and neutrons in an atom. Mass number= # of protons + # of neutrons.
Average atomic mass s the average mass of the element's isotopes, weighted according to the abundance of each isotope.
Ion is an atom that is no longer neutral because it has gained or lost electrons.
Metals often shiny, good conductors of electricity and thermal energy:easily pulled into wires and hammered into sheets.
Matalloids have properties in common with both metals and nonmetals often used as semiconductors in electronic devices.
Nonmetals poor conductors of thermal energy and electricity, most are gases at room temperature: solid forms tends to be brittle.
Created by: jmelendez