3.1 What is the history of the atom?

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Presentation transcript:

3.1 What is the history of the atom? Unit 3 ATOMIC CONCEPTS 3.1 What is the history of the atom? AIM: What is an atom and who are Dalton, Thomson and Rutherford? DO NOW: Both of the pictures are results related to the structure of the atom. Make some observations. What are some similarities and differences? What kind of conclusions can you draw about the atom? WRITE IT DOWN

VOCABULARY Electron Atomic number Atom Atomic mass Orbital Gold Foil Experiment Wave-Mechanical Model Subatomic particles Proton Neutron Electron Atomic number Atomic mass Electron configuration Average atomic mass Isotope Valence electron Lewis dot diagram Ground state Excited state Periodic Table Charge

The basic unit of matter WHAT IS AN ATOM? A tiny particle The basic unit of matter

STATIONS 1. Conduct the reading at each station. 2. Answer the questions in your notes using the reading. 3. Fill your GRAPHIC ORGANIZER as you complete the stations. STATION 1 STATION 1 STATION 2 STATION 2 STATION 3 STATION 3

INDEPENDENT PRACTICE worksheet NEXT Complete the INDEPENDENT PRACTICE worksheet When you are done, you may work on the following: CHEMISTRY VOCABULARY JOURNAL - you will be allowed to use this on your quizzes and (some of) your exams

STATION 1 JOHN DALTON (1803) All matter is made of atoms Atoms are indivisible Atoms are indestructible All atoms of an element are identical Compounds are formed with two or more kinds of atoms Chemical reaction is a rearrangement of atoms.

STATION 2 J.J. Thomson (1897) Experimentally discovered that atoms have NEGATIVE CHARGES Discovered the ELECTRON

STATION 3 Rutherford’s Gold Foil Experiment (1911) http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/ruther14.swf QUESTION: If the plum-pudding model is composed of positive and negative charges dispersed uniformly (“spread evenly”) in a sphere, then what do you predict will happen if you shoot positive particles at it?

STATION 3 Rutherford’s Gold Foil Experiment (1911) RESULTS OF THE EXPERIMENT: Atoms are mostly empty space Atom has a DENSE, POSITIVELY CHARGED NUCLEUS surrounded by electrons