Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces...

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Atomic Theory

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Transcript of Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces...

Page 1: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Atomic Theory

Page 2: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Ancient Greeks

• Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller.

• The word ATOM means “indivisible”

Just an idea, no “picture” of what the atom looks like.

Page 3: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Dalton’s Theory

Theory: All matter is made up of individual particles called atoms, which cannot be created, divided, or destroyed. (sound familiar?)

Features:

1. Solid, no “insides”.

2. Atoms of the same element are exactly alike.

(1803)

Page 4: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Thomson’s Theory

Theory: Atoms CAN be divided into smaller pieces. [“Chocolate Chip Cookie Model”]

Feature:

1.Discovered the negatively charged ELECTRON.

(1897)

electrons

Page 5: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Rutherford’s Theory

Theory: Atoms are mostly empty space.[Gold Foil Experiment]

Feature: Proved that atom has POSITIVELY charged NUCLEUS

The Gold Foil Experiment (He shot a stream of positive particles at piece of gold foil- most went straight through and only a few bounced back- this proved that atoms were mostly EMPTY SPACE, the ones that bounced had hit a small solid center, the nucleus.)

(1911)

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nucleus

Page 6: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Gold Foil Experiment

Thomson

Rutherford

Page 7: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Bohr’s Theory

Theory: Electrons move around outside the nucleus in specific patterns called ENERGY LEVELS.

Feature: Electrons orbit around nucleus in specific paths, just like planets around the Sun in the solar system.

(1913)

What does this remind you of?

Energy levels

Page 8: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Electron Cloud (Quantum) Model

Theory: Predicts where electrons MAY be located in an atom. [*Closest to what we think the atom is today!*]

Feature: Cannot know exactly where the electrons are at any time, they are “in the cloud”.

(1926)

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Electrons anywhere at any time

Page 9: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

THE BIG IDEA

As technology has improved, our idea of the ATOM has changed over time.

(our models have gotten better!)

Page 10: Atomic Theory. Ancient Greeks Democritus’ idea (theory) was: All matter is made of small pieces that cannot be divided any smaller. The word ATOM means.

Video Links

• History of Atomic Theory Song – Veritasium

• The History of Atomic Chemistry: Crash Course Chemistry #37


Atomic Theory Date. Democritus Date 460-370 B.C. Democritus was a philosopher; did no research He thought that everything was made up of tiny round things.

Atomic Theory Date. Democritus Date 460-370 B.C. Democritus was a philosopher; did no research He thought that everything was made up of tiny round things.

Atomic Model History. Early Ideas Greeks thought that there were 4 elements that made up ALL matter: –air, earth, fire, and water Democritus – first to.

Atomic Model History. Early Ideas Greeks thought that there were 4 elements that made up ALL matter: –air, earth, fire, and water Democritus – first to.

Democritus, Aristotle, and Other Greeks Ben Crouch.

Democritus, Aristotle, and Other Greeks Ben Crouch.

Atomic Theory. Democritus – 460 – 370 BC Matter consisted of tiny particles “atomos” Ideas were wrong.

Atomic Theory. Democritus – 460 – 370 BC Matter consisted of tiny particles “atomos” Ideas were wrong.

Unit # 4 Atomic Theory History Greeks n Democritus (460-370BC) – Matter is made of atoms. - Different kinds of shapes and sizes n Aristotle ( 364 -322.

Unit # 4 Atomic Theory History Greeks n Democritus (460-370BC) – Matter is made of atoms. - Different kinds of shapes and sizes n Aristotle ( 364 -322.

Atomic Physics. Atomic structure discovered Ancient Greeks Democritus (460-362 BC) - indivisible particles called “atoms” Prevailing argument (Plato and.

Atomic Physics. Atomic structure discovered Ancient Greeks Democritus (460-362 BC) - indivisible particles called “atoms” Prevailing argument (Plato and.

The History of the Atom From Democritus to Today’s Modern Theory.

The History of the Atom From Democritus to Today’s Modern Theory.

Scientists of Atomic Theory Unit 2 Democritus 460 B.C.- 370 B.C. This Greek philosopher was among the first to suggest the existence of atoms. Democritus.

Scientists of Atomic Theory Unit 2 Democritus 460 B.C.- 370 B.C. This Greek philosopher was among the first to suggest the existence of atoms. Democritus.

Atomic Structure. Atomic Theory Democritus (460-370 B.C.) –Greek philosopher –Democritus proposed that the world is made up of empty space and tiny particles.

Atomic Structure. Atomic Theory Democritus (460-370 B.C.) –Greek philosopher –Democritus proposed that the world is made up of empty space and tiny particles.

Atomic Structure History of Atomic Theory from Democritus to Rutherford.

Atomic Structure History of Atomic Theory from Democritus to Rutherford.

Atomic Theory. Democritus The Greek philosopher Democritus (460 B.C. – 370 B.C.) was among the first to suggest the existence of atoms (from the Greek.

Atomic Theory. Democritus The Greek philosopher Democritus (460 B.C. – 370 B.C.) was among the first to suggest the existence of atoms (from the Greek.

+ ATOMIC THEORY. + Democritus Atom Democritus is an Ancient Greek philosopher born in Abdera, Thrace, Greece He was said to be the first step toward the.

+ ATOMIC THEORY. + Democritus Atom Democritus is an Ancient Greek philosopher born in Abdera, Thrace, Greece He was said to be the first step toward the.

The History of Atomic Theory Mr Nelson. Democritus The Greek philosopher Democritus began the search for a description of matter more than 2400 years.

The History of Atomic Theory Mr Nelson. Democritus The Greek philosopher Democritus began the search for a description of matter more than 2400 years.

{ Aristotle and Democritus: The Atomic Theory By: Sam Berman and Emilee Williams.

{ Aristotle and Democritus: The Atomic Theory By: Sam Berman and Emilee Williams.

Chapter 2 Atoms, Molecules, and Ions History of Atomic Theory Started with the Greeks and four elements (earth, air, water and fire) Democritus termed.

Chapter 2 Atoms, Molecules, and Ions History of Atomic Theory Started with the Greeks and four elements (earth, air, water and fire) Democritus termed.

Dismissed idea of the atom. Early Greeks Two schools of thought: Matter is made of indestructible particles called “atomos” Plato (428-348 BC) Democritus.

Dismissed idea of the atom. Early Greeks Two schools of thought: Matter is made of indestructible particles called “atomos” Plato (428-348 BC) Democritus.

The Atom Chapter 3. From Idea to Theory Democritus, Greek philosopher, 400 B.C., introduced the concept of an atom, an ‘indivisible’ particle. Democritus,

The Atom Chapter 3. From Idea to Theory Democritus, Greek philosopher, 400 B.C., introduced the concept of an atom, an ‘indivisible’ particle. Democritus,

The Development of a Modern Theory of the Atom Aristotle Democritus.

The Development of a Modern Theory of the Atom Aristotle Democritus.

Chapter 2 Atoms, Molecules, and Ions History n Greeks n Democritus and Leucippus - atomos n Aristotle- elements n Alchemy n 1660 - Robert Boyle- experimental.

Chapter 2 Atoms, Molecules, and Ions History n Greeks n Democritus and Leucippus - atomos n Aristotle- elements n Alchemy n 1660 - Robert Boyle- experimental.

The Greeks - Democritus 450 B.C. Believes there is a fundamental particle that cannot be broken. The particle is invisible. Coins the term “atom”

The Greeks - Democritus 450 B.C. Believes there is a fundamental particle that cannot be broken. The particle is invisible. Coins the term “atom”