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level: Personalities and Models

Questions and Answers List

level questions: Personalities and Models

Question	Answer
Bohr's atomic model is also called	The planetary model
"Alpha particles, Gold Foil Experiment" discovery of alpha particles, positively charged particles emitted from radioactive elements Devised an experiment to investigate the structure of positive and negative charges in the atom concluded that an atom had a small, dense, positively charged center that repelled its positively charged “bullets.” He called the center of the atom the “nucleus” The nucleus is tiny compared to the atom as a whole.	Ernest Rutherford (1871 - 1937)
The first credited for the discovery of the atom	Democritus (400 B.C.E)
Proposed the Atomic Theory of Matter in 1803 Solid Sphere Model or Bowling Ball Model	John Dalton
Negatively charged electrons (raisins or blueberries) are surrounded by a positively charged "pudding" (or muffin) Proposed in 1904 Plum Pudding Model or Blueberry Muffin Model	J.j Thomson Atomic Model
Discovered the neutron in 1932	James Chadwick
Canal Rays and Protons (1886) He noted streams of positively charged particles in cathode rays in 1886 Canal Rays must be positive	Eugene Goldstein
Discovery of the Electron	J.J Thomson
Father of Modern Chemistry	Antoine-Laurent Lavoisier
Meyer and Mendeleev arranged the periodic table according to	Atomic weights
Father of Modern Periodic Table.	Henry Moseley
Atoms that have the same atomic number (Z) but different mass numbers (A).	Isotopes
Periodic Trend: Ionization energy. From Bottom to Top. increases or decreases?	Increases
Bohr's atomic model is also called	The planetary model
He used the Law of Octaves in arranging the periodic table.	John Newlands
Is a variant of a substance consisting of only one type of atom. a new molecular configuration with new physical properties	Allotrope
Developed "Triads", groups of 3 elements with similar properties.	Johann Dobereiner
"Triads", groups of 3 elements with similar properties.	1 Lithium, Sodium and Potassium 2 Calcium, Strontium and Barium 3 Chlorine, Bromine and Iodine 4 Sulfur, Selenium and Tellurium