Atomic Structure Timeline: Name _______________________________________________ Date ________________ Class______________ Directions: Use the internet to complete the following questions. 1. In each box, write the name of the scientist(s) associated with the statement. Choose from among the following scientists: Determine in which time period did the following scientist worked with the structure of the atom and write that beside each scientist. Time periods to choose from are: 440 B.C. ,1803, 1897, 1911, 1913, and the twentieth century. Democritus 440 B.C. Rutherford 1911 • • Thomson 1897 Dalton 1803 • • Bohr 1913 Schrödinger and Heisenberg • • 2. On a separate sheet of paper, construct a timeline, and label the following: 440 B.C., 1803, 1897, 1911, 1913, and the twentieth century. 4 Atomic Timeline Atoms constantly move. There are small, negatively All substances are made of charged particles inside an atom. atoms. 1897 (Thomson) He conducted the gold foil There is a small, dense, experiment. positively charged Elements combine in specific nucleus. 1911 (Rutherford) proportions. Most of an atom’s mass is in the nucleus. Electrons jump between levels from path to path. 1913 (Bohr) He conducted the cathode-ray tube experiment. 1897(Thomson) Atoms of different elements are different. Atoms contain mostly empty space. Atoms are small, hard particles. He conducted experiments in combining elements. Atoms are “uncuttable.” Electron cannot be predicted. Electrons travel in definite paths. Electrons move in empty space in the atom. His theory of atomic structure led to the model. “plum-pudding” Electrons are found in electron clouds, not paths. Atoms of the same element are exactly alike.
Atomic Structure Timeline: Name _______________________________________________ Date ________________ Class______________ Directions: Use the internet to complete the following questions. 1. In each box, write the name of the scientist(s) associated with the statement. Choose from among the following scientists: Determine in which time period did the following scientist worked with the structure of the atom and write that beside each scientist. Time periods to choose from are: 440 B.C. ,1803, 1897, 1911, 1913, and the twentieth century. • Democritus 440 B.C. • Rutherford 1911 • Thomson 1897 • Dalton 1803 • Bohr 1913 • Schrödinger and Heisenberg 2. On a separate sheet of paper, construct a timeline, and label the following: 440 B.C., 1803, 1897, 1911, 1913, and the twentieth century. 4 Atomic Timeline There are small, negatively charged particles inside an atom. 1897 (Thomson) There is a small, dense, positively charged nucleus. 1911 (Rutherford) Most of an atom’s mass is in the nucleus. Electrons jump between levels from path to path. 1913 (Bohr) He conducted the cathode-ray tube experiment. 1897(Thomson) Atoms of different elements are different. Atoms contain mostly empty space. Atoms are small, hard particles. He conducted experiments in combining elements. Atoms are “uncuttable.” Electron cannot be predicted. Electrons travel in definite paths. Electrons move in empty space in the atom. His theory of atomic structure led to the “plum-pudding” model. Electrons are found in electron clouds, not paths. Atoms of the same element are exactly alike. Atoms constantly move. All substances are made of atoms. He conducted the gold foil experiment. Elements combine in specific proportions.
Atomic%20Structure%20Timeline.docx