Topic: Atomic Structure Aim: How has the atomic model changed over time? Do Now: How would you define “atom”? HW:

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Presentation transcript:

Topic: Atomic Structure Aim: How has the atomic model changed over time? Do Now: How would you define “atom”? HW:

Atomic Theory Atom Smallest unit that contains all of the properties of an element Building block of all matter Developed with the contributions of many scientists

Dalton’s Theory

Dalton’s Model Hard sphere indivisible

Revised Models J J Thomson Atoms can be subdivided (-) charged particles (electrons) (+) charged particles “plum pudding” model

Ernest Rutherford’s Gold Foil Experiment I love atoms!

Rutherford’s Experiment

What did Rutherford’s experiment show? most α particles passed through the gold foil atom is mostly empty space Few α particles were deflected atoms have a small, (+) charged nucleus

Niels Bohr Central, dense nucleus e- surround in fixed orbits, like planets

Wave Mechanical Model Present-day model (Schrodinger, Heisenberg, Chadwick) Central nucleus Electron clouds Orbital region in which e- are most likely to be found (they’re constantly moving – can’t track an exact path) ONLY REAL MODIFICATION FROM BOHR MODEL IS THE LOCATION OF ELECTRONS! Summary

Sample Question When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of a gold atom consists of ____. deuterons neutrons protons unoccupied space