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CHAPTER 3

QuestionAnswer
Plum-Pudding Model a model of the atom developed by J.J. Thompsom; it included an atom with electrons stuck randomly inside and contained no nucleus
Gold-Foil Experiment an experiment performed by Rutherford; positively charged alpha particles were sent at a piece of gold foil; the experiment resulted in the discovery of the atomic nucleus
Orbitals an area of the atomic model which predicts where an electron is likely to be
Nucleus a dense, positively charged core of an atom, made up of nucleons (protons and neutrons)
Proton a subatomic particle with a positive charge
Electron a subatomic particle with a negative charge
Neutron a subatomic particle with no charge
Mass Number the sum of neutrons and protons in an atomic nucleus
Atomic Number a number equal to the number of protons in an atom, also equivalent to the number of electrons
Ion a particle that is either positively or negatively charged as a result of gaining or losing electrons
Isotope one of two or more atoms with the same atomic number but different numbers of neutrons
Atomic Mass the mass of an atom
Valence Electrons the outermost electrons in an atom; determine how atoms react with other atoms
Octet when you have eight valence electrons
Excited State an elevation of energy above the baseline state
Ionization Energy the energy required to remove the outermost electron in an atom
Electron Affinity when an electron is added to form a negative ion
Electronegativity the tendency of an atom to attract electrons in the formation of an ionic bond
Created by: ssincerbox
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