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Chapter Three

Atom the smallest component of an element
Plum-pudding Model The plum pudding model of the atom was proposed by J. J. Thomson
Gold-Foil Experiment Performed by Rutherford. Discovered that the Atom is mostly made of empty space and is positively charged
Orbitals Where Electrons are located
Nucleus Cotains the atoms Protons (+) and neutrons, mostly empty space.
Proton is one amu, positively charged
Electron Is Negatively charged, has a very small mass.
Mass Number The sum of the number of Protons and nuetrons of an atoms nucleus
Atomic Number representing the relative position of an element in the periodic table, is equal to the number of protons and electrons in the atom
Ion a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
Isotope one of two or more atoms with the same atomic number but with different numbers of neutrons
Atomic Mass the mass of an atom of a chemical element expressed in atomic mass units
Valence Electrons In chemistry, valence electrons are the outermost electrons of an atom,
Octet when an orbital has 8 electrons in it, it is called dan octet
Excited State Excitation is an elevation in energy level above an arbitrary baseline energy state
Ionization Energy The amount of energy needed to remove an electron from a given kind of atom
Electron Affinity The Electron affinity of a molecule or atom is the energy change when an electron is added to the neutral species to form a negative ion.
Electronegativity the tendency of an atom or radical to attract electrons in the formation of an ionic bond
Created by: Michaela.Kinney