Name ______
Date ______
Class Period ______
Atoms & Their Characteristics
Choose the letter of the definition that best defines the vocabulary word.
_____1. anode_____2. cathode_____3. electrode
_____4. electron_____5. electron cloud_____6. element
_____7. neutron_____8. proton
A. negatively charged subatomic particle located outside the nucleus
B. positively charged subatomic particle
C. positively charged electrode which attracts negatively charged particles
D. piece of metal through which electrical current enters/leaves vacuum tube - may be
either positively or negatively charged
E. subatomic particle located in the nucleus that has no electrical charge
F. substance that exists in its purest form; all atoms being identical
G. random paths traveled by electrons around the nucleus
H. negatively charged electrode which attracts positively charged particles.
Write the name of the scientist next to the contribution(s) for which the scientist is known.
______1. ideas overshadowed by Aristotle
______2. discovered electrons
______3. shared 1903 Nobel Prize in Physics with the Curies.
______4. discovered alpha and beta waves
______5. followed scientific method
______6. identified Helium
______7. Stated that nature and matter are intertwined
______8. proposed the earliest atomic theory
______9. first to observe radioactive decay
______10. responsible for defining atomic weight
______11. proved electrons were negatively charged
______12. named Hydrogen
______13. discovered Uranium could cause a photograph to develop
without chemicals
______14. theory of simple machines
______15. compiled others’ research into a book about Quantum
Theory
______16. theory of motion
______17. proposed 4 part atomic theory
______18. stated atom was a sphere in which both positive and
negative particles are scattered throughout randomly
______19. presented early version of Law of Conservation of Matter
______20. worked on the creation of the atom bomb
______21. developed cathode ray tube eventually used in televisions
and computers
______22. first to use math to explain molecular behavior
______23. responsible for developing chemical symbols for each
element
______24. identified Radium
______25. created first periodic table
______26. carefully collected and recorded data from performed
experiments
______27. discovered x-rays during a failed cathode ray tube
experiment
______28. brought quantum physics into pop culture in the early
1900s
______29. created a model of the structure of atoms that included a
nucleus and multiple shells
______30. tweaked Bohr’s model by suggesting electrons exist in
clouds not shells
______31. discovered Barium could be used as a fission element
______32. theory of elementary particles
______33. proved quarks existed
______34. believed quarks existed in groups of 4
______35. invented a tool to register radioactive emissions
______36. identified the neutron as a subatomic particle with no
electrical charge
______37. classified the actinide group of elements
______38. discovered the auger effect
______39. proved atoms had a nucleus
______40. received the Nobel Prize in conjunction with Otto Frisch