 Democritus (~400 BC) Greek philosopher who proposed that matter was made of tiny individual particles called “atomos” Believed atoms were indivisible.

Slides:

Advertisements

Similar presentations

Atomic Theory Timeline

Advertisements

The History of the Atom.

Atomic Theory and the Atom

Early Theories & Subatomic Particles ( )

What are important discoveries related to the structure of an atom?

Chapter 4: Discovery of Atomic Structure. Prentice Hall © 2003Chapter 2 The Discovery of Atomic Structure An ancient Greek named Democritus was the first.

PART ONE ATOMIC THEORY. Over the course of thousands of years our idea of what matter is made of and what the atom looks like has changed dramatically.

The Development of the Atomic Theory

The Historical View of Atomic Structure Continued.

History of Atom Flip Book

1 The Structure of the Atom. 2 Early Theories of Matter.

Brief History of Atomic Theory. 1 st atomic models In 400 BC, the model looked like a solid indivisible ball In 400 BC, the model looked like a solid.

Rev 6/7/ BC Atomic Model Development.

The Atom - Scientists. Philosophers Democritus – believed matter was not infinitely divisible THERE WERE NO EXPERIMENTS TO TEST HIS IDEAS Matter is composed.

ATOMIC THEORY. WHAT IS AN ATOM? What makes the elements on the Periodic Table different from each other? What is the name for the center of an atom? What.

Smallest particle of an element that retains the properties of the element.

I. Atomic History A.Democritus ( BC) 1.Ancient Greek philosopher 2.Proposed matter was made of tiny indivisible particles 3.He called them atoms.

Atomic Structure. Early Theories of Matter Democritus ( BCE) Democritus ( BCE) Greek philosopher Greek philosopher First to propose the.

Do Now Determine the stationary object in the middle of the box without peaking in the box.

1 Modern Chemistry Chapter 3 Atoms: the building block of matter.

Atomic Theory: the beginning

Chapter 4 Atomic Structure

History of the Atom Notes

How we got to where we are now

Dalton’s Atomic Theory

4.1 NOTES The History of the Atom

Chapter 4 The Structure of the Atom

Early Models of the Atom

Atomic Theory Label the 3 different particles that make up an atom

Do Now Determine the stationary object in the middle of the box without peaking in the box.

Structure of the Atom Chapter 4.

Origin of the idea of atom…

Atomic Structure Democritus Evolution of Atomic theory Dalton

Chapter 4: The Structure of the Atom 4.1 The Structure of the Atom

Unit 2: Atomic Theory & Structure

Work in partners and grab a textbook or your phone and make a timeline of the main scientists who contributed to the atomic structure. Include Democritus,

Chapter 5 Atomic Structure and the Periodic Table

Chapter 4: atoms.

Warm-Up Draw a picture of an atom. Be as specific as you can!

Origin of the idea of atom…

Chapter 3- Atomic Structure

Atomic Structure Ch. 4.

Atomic Theory A Brief History.

Early Ideas About Matter

Do First Actions: Turn in yesterday’s electron, proton, and neutron practice if you did not get it stamped Questions: If a neutral atom has an atomic mass.

Research Hypothesis Theory An educated guess based on an observation

Early History of the Atom

2.1 History of the Atom Objectives S1 and S2

4.1 & 4.2 Early Theories & Subatomic Particles

The atom Chapter 4.

Chapter #3 Atoms: The Building Blocks of Matter Chapter 3A ATOMS:

Chapter 4 The Structure of an Atom.

Atomic Structure Chp 4.

Atomic Structure.

Section 4.2 Pages

Atomic Structure An atom is the smallest particle of an element that retains its identity in a chemical reaction. Although early philosophers and scientists.

CHAPTER 3 – The Structure of the Atom

You think you know, but do you???

Chapter 4: Atomic Structure

Development of Atomic Structure

4.1 Defining the Atom 4.2 Atomic Structure

The Structure of the Atom

Honors Coordinated Science II Wheatley-Heckman

Presentation transcript:

 Democritus (~400 BC) Greek philosopher who proposed that matter was made of tiny individual particles called “atomos” Believed atoms were indivisible and indestructible Approach was not based on the scientific method

 Period 5- Thursday, 10/22  Atomic Structure Test TOMORROW!  Protons, neutrons, and electrons  Average atomic mass calculations  Atomic History- Names, experiments, models, timeline  Use pgs in packet for review questions  key will be posted on shscience.net



 John Dalton (1800) Proposed that atoms are tiny, indestructible particles, with no internal structure Known as the hard sphere model

 1) Matter is made up of tiny, indivisible particles called atoms 2) All atoms of a given element are identical 3) Atoms of different elements have different properties and masses Dalton’s Theory

 4) Different atoms combine in whole number ratios to form compounds 5) In a chemical reaction, atoms are separated, rearranged, or combined- but never changed into atoms of another element Dalton’s Theory, cont.

 Sir William Crookes (1875)

 Discovered the electron through an experiment with a cathode ray tube hill.com/sites/ /student_view0/chapter2/anima tions_center.html hill.com/sites/ /student_view0/chapter2/anima tions_center.html Proposed the “Plum Pudding Model” J.J. Thomson (1897)

 Performed the oil drop experiment to determine the charge on an electron ( x coulombs) Robert Millikan (1909)

 Performed the Gold Foil Experiment Bombarded a thin piece of gold foil with a positive stream of alpha particles ions/chang_2e/rutherfords_experiment.swf 3 observations and 3 conclusions Known as the nuclear model Ernest Rutherford (1911)