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Chem 105 Ch 2

TermDefinition
Subatomic particles protons, neutrons, and electrons
Thomson cathode ray tube experiment found mass-to-charge ratio of election
Cathode rays beam of electrons
Electrons negatively charged subatomic particle with a very small mass (9.109x10^-31g)
Millikan oil drop experiment mass of an electron
Cations and anions positive and negative ions respectively
Rutherford gold foil experiment shot positive helium nuclei at gold foil, most go through, some reflected a little, some completely; found most of atom is empty space with a dense nucleus
Atomic nucleus nucleus contains protons and neutrons, protons always the same for an element, neutrons may differ
Atomic mass units one twelfth the mass of carbon 12
1 amu 1.66054x10^-27 kg
Nuclide/isotope different number of neutrons
Atomic number number of protons
Mass number sum of protons plus neutrons
Periodic table chart of elements in order of atomic number, reflect physical
Periods rows
Groups columns
Main group elements everything but
Metals everything left of metalloids
Alkali metals group 1
Alkaline earth metals group2
Transition metals d level
Metalloids steps
Nonmetals not a metal, right of metalloids
Halogens group 17
Noble gases group 18
Atomic mass weighted average of natural abundance of isotopes
Natural abundances percentage of
Formula mass for formula unit
Mole chemist's dozen
Avogadro’s number 6.0221x10^-23
Molar mass mass per mole of an element
Created by: ksheehy96