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IGHS Winkels

Physical Science Chapter 4

TermDefinition
Nucleus a dense, positively charged mass located in the center of the atom
Proton a positively charged subatomic particle that is found in the nucleus of an atom
Electron a negatively charged subatomic particle that is found in the space outside the nucleus
Neutron a neutral subatomic particle that is found in the nucleus of an atom
Atomic number of an element equals the number of protons in an atom of that element
Mass number of an atom is the sum of the protons and neutrons in the nucleus of that atom
Isotopes are atoms of the same element that have different numbers of neutrons and different mass numbers
Energy Levels the possible energies that electrons in an atom can have
Electron Cloud a visual model of the most likely locations for electrons in an atom
Ground State when all the electrons in an atom have the lowest possible energies
Electon Configuration the arrangement of electrons in the orbitals of an atom
Orbital a region of space around the nucleus where an electron is likely to be found
Dalton's Theory all matter is made up of individual particles called atoms, which cannot be divided
Thomson's Model the negative charges are evenly scattered throughout an atom filled with a positively charged mass of matter (choc. chip ice cream
Rutherford's Model all of an atom's positive charge is concentrated in its nucleus
Bohr's Model electrons move with constant speed in fixed orbits around the nucleus, like planets around the sun
Created by: Winkels