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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 on theme: "Topic: Atomic Structure Aim: How has the atomic model changed over time? Do Now: How would you define “atom”? HW:"— Presentation transcript:

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

2 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

3 Dalton’s Theory

4 Dalton’s Model Hard sphere indivisible

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

6 Ernest Rutherford’s Gold Foil Experiment
I love atoms!

7 Rutherford’s Experiment

8 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

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

10 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

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12 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

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