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Unit 2 Vocab

CHEM 142 Unit 2 Vocab

TermDefinition
Law of Conservation of Mass In a chemical reaction, matter is neither created or destroyed
Law of Definite Properties All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements
Law of Multiple Proportions When two elements (A and B) form two different compounds, the masses of B that combine with 1 gram of A can be expressed as a ratio of small whole numbers
Cathode Ray Experiment Determined the charge:mass ratio of electrons
Oil Drop Experiment Determined the charge of and mass of electrons
Gold Foil Experiment Determined the location of protons in an atom
Bombardment Experiment Determined the presence of neutrons in an atom
Proton Subatomic particle that gives an atom its identity
Neutron Subatomic particle that has no charge
Electron Subatomic particle that dictates the reactivity of an element
Ionic Charge The number of protons minus the number of electrons
Isotopes Atoms with the same number of protons but different number of neutrons
Mass Number The number of protons and neutrons combined
Atomic Number The number of protons
Periodic Law When the elements are arranged in order of increasing atomic number, certain sets of properties recur periodically
Periods Rows on the periodic table
Groups Columns on the periodic table
Alkali Metal Elements belonging to Group 1 on the Periodic Table
Alkaline Earth Metals Elements belonging to Group 2 on the Periodic Table
Halogen Elements belonging to Group 7 on the Periodic Table
Noble (Inert) Gas Elements belonging to Group 8 on the Periodic Table
Created by: user-1742018
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