The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning...

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The History of The History of Atomic Atomic Structure Structure

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Page 1: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

The History of Atomic The History of Atomic StructureStructure

Page 2: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Democritus

Named the atom from the Greek word “atomos” meaning indivisible.

Wrote that atoms were the smallest unit of matter to keep its identity.

http://www.svarog.org/filozofija/graph/democritus.jpg
http://www.uoregon.edu/~ch111/images/democritus.gif
Page 3: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

John Dalton

England 1780’s All matter is made

up of atoms. All atoms of the

same element are the same.

Atoms combine in specific ratios.

There is nothing smaller than an atom.

http://images.google.com/imgres?imgurl=zebu.uoregon.edu/~js/21st_century_science/images/dalton_atoms.gif&imgrefurl=http://zebu.uoregon.edu/~js/ast123/lectures/lec04.html&h=201&w=383&prev=/images%3Fq%3Djohn%2Bdalton%26svnum%3D10%26hl%3Den
http://www.chemheritage.org/EducationalServices/webquest/dalton/dalton02.gif
Page 4: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

J. J. Thomson Discovered the

electron while running electricity through a gas.

Discovered that electrons were negative.

“Plum pudding” model of the atom.

http://www.admin.cam.ac.uk/univ/innovation/thomson.jpeg
Page 5: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Marie & Pierre Curie

Provided evidence for the existence of protons and neutrons.

Discovered radium and polonium.

Marie Curie was the first female winner of the Nobel prize and the first double winner.

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Page 6: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Ernest Rutherford

Discovered that the nucleus was positively charged and very tiny.

Found that the atom is mostly empty space.

http://library.thinkquest.org/3471/genesis2.jpg
http://library.thinkquest.org/3471/genesis2.jpg
Page 7: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Niels Bohr

Developed the “solar system” model of the atom.

The nucleus in the center of the atom is made of protons (+) and neutrons.

Electrons (-) orbit the nucleus like the planets around the sun.

http://images.google.com/imgres?imgurl=csep10.phys.utk.edu/astr162/lect/light/bohrframe/bohr2.gif&imgrefurl=http://csep10.phys.utk.edu/astr162/lect/light/bohr.html&h=204&w=205&prev=/images%3Fq%3Dbohr%26start%3D140%26svnum%3D10%26hl%3Den%26sa%3DN
Page 8: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Electron Cloud Model The current model

of the atom. Electrons do not

orbit the nucleus in orderly paths.

Electrons move around the nucleus at near the speed of light in a general area.

Research continues.

http://images.google.com/imgres?imgurl=www.mtsu.edu/~sschmidt/Cognitive/intro/cloud.jpg&imgrefurl=http://www.mtsu.edu/~sschmidt/Cognitive/intro/intro.html&h=283&w=281&prev=/images%3Fq%3Delectron%2Bcloud%2Bmodel%26svnum%3D10%26hl%3Den%26sa%3DG
Page 9: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Summary

Page 10: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Proton Don says “If all the elements are on the periodic table, where’s the cheese?”

http://www.funbrain.com/periodic/protondo.gif
Page 11: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Protons

Found in the nucleus of the atom.

Have a charge of +1

Have a mass of 1 atomic mass unit (amu)

Page 12: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Neutrons

Found in the nucleus of the atom.

Mass of 1 amu Neutrons have no

charge.

Page 13: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Electrons

Found in orbits (energy levels or shells) around the nucleus.

Travel at near the speed of light.

Charge is –1 Mass is 1/1800th

amu.

http://www.cnde.iastate.edu/ncce/K12/RT_K12/electrons/atom.jpg
Page 14: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

What makes one element different from another?

The number of protons is always the same as the atomic number.

The number of electrons is usually the same as the atomic number.

To find the number of neutrons: take the atomic mass, rounded to the nearest whole number, and subtract the atomic number.

Page 15: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Finding the number of neutrons

The mass number of this isotope of lithium is 7.

Notice that 7 is equal to the total number of protons and neutrons.

If you remove the protons (atomic number), the neutrons are left.

Page 16: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Isotopes of HydrogenWhat do they have in common?

What are the differences?

Page 17: The History of Atomic Structure. Democritus Named the atom from the Greek word “atomos” meaning indivisible. Wrote that atoms were the smallest unit.

Basic Chemistry Atoms, Elements & Molecules. Atoms Around Us “To understand the very large, we must understand the very small” Democritus Atoms Atomos.

Basic Chemistry Atoms, Elements & Molecules. Atoms Around Us “To understand the very large, we must understand the very small” Democritus Atoms Atomos.

Atomos: Not to Be Cut or “indivisible” The History of Atomic Theory.

Atomos: Not to Be Cut or “indivisible” The History of Atomic Theory.

ATOMIC STRUCTURE ? Kenneth E. Schnobrich. A Brief History About 460 B.C. - a Greek Philosopher, Democritus, developed the idea of atoms (atomos) as small.

ATOMIC STRUCTURE ? Kenneth E. Schnobrich. A Brief History About 460 B.C. - a Greek Philosopher, Democritus, developed the idea of atoms (atomos) as small.

Atomic Theory and Structure Chapters 4-5 Atomic Theories Democritus ~ 400 BC believed that atoms were indivisible and indestructible Dalton ~ 1800’s.

Atomic Theory and Structure Chapters 4-5 Atomic Theories Democritus ~ 400 BC believed that atoms were indivisible and indestructible Dalton ~ 1800’s.

Development of Atomic Theory 400 B.C. -Democritus was first to use the word : atom atomos meaning “indivisible” Aristotle (famous philosopher) disputed.

Development of Atomic Theory 400 B.C. -Democritus was first to use the word : atom atomos meaning “indivisible” Aristotle (famous philosopher) disputed.

Regents Chemistry - Scarsdale Public Schools / Overvie · Web viewThis finite particle he called the atom, from the Greek word atomos, which means “indivisible”. Unfortunately,

Regents Chemistry - Scarsdale Public Schools / Overvie · Web viewThis finite particle he called the atom, from the Greek word atomos, which means “indivisible”. Unfortunately,

Democritus: The Atom (around 400 BCE) Democritus thought matter could be divided into smaller and smaller pieces until a single indivisible particle is.

Democritus: The Atom (around 400 BCE) Democritus thought matter could be divided into smaller and smaller pieces until a single indivisible particle is.

Ch. 3: Atoms 3.1 Foundations. History Democritus named the most basic particle named the most basic particle atom- means “indivisible atom- means “indivisible.

Ch. 3: Atoms 3.1 Foundations. History Democritus named the most basic particle named the most basic particle atom- means “indivisible atom- means “indivisible.

Particles and Waves. Early Atom Models Democritus (2500 years ago)—tiny indivisible particles, atmos Dalton (1803) Each element composed of extremely.

Particles and Waves. Early Atom Models Democritus (2500 years ago)—tiny indivisible particles, atmos Dalton (1803) Each element composed of extremely.

Atoms: The Building Blocks of Matter. PART 1 Democritus [400 B.C] Greek philosopher Hypothesized: Nature has a basic indivisible particle of which.

Atoms: The Building Blocks of Matter. PART 1 Democritus [400 B.C] Greek philosopher Hypothesized: Nature has a basic indivisible particle of which.

Creating Atomic Content For Taxonomy / Content Database Driven Documents Mark Cashman mcashman@temporaldoorway.com atomic adj. [from Gk. `atomos', indivisible]

Creating Atomic Content For Taxonomy / Content Database Driven Documents Mark Cashman [email protected] atomic adj. [from Gk. `atomos', indivisible]

Atomic Structure The Idea of the Atom Early Models Greek philosophers – 450 B.C. what is the smallest particle? Democritus - Particles are atomos An.

Atomic Structure The Idea of the Atom Early Models Greek philosophers – 450 B.C. what is the smallest particle? Democritus - Particles are atomos An.

Chapter 3 Chemistry The Atom I. Early ideas A. ___________ (450 BC)- all matter is made of tiny indivisible particles – atomos. _________- the smallest.

Chapter 3 Chemistry The Atom I. Early ideas A. ___________ (450 BC)- all matter is made of tiny indivisible particles – atomos. _________- the smallest.

Electrons in Atoms. Democritus (400 B.C.) Proposed that matter was composed of tiny indivisible particles Not based on experimental data Greek: atomos.

Electrons in Atoms. Democritus (400 B.C.) Proposed that matter was composed of tiny indivisible particles Not based on experimental data Greek: atomos.

History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible particles. Gr. atomos.

History of the Atom. Democritus (400 BC) Proposed that matter was composed of tiny, invisible particles. Gr. atomos.

Chapter 4 Atomic Structure p. 101. Section 4.1 Defining the Atom Greek philosopher Democritus Greek philosopher Democritus suggested atoms (Greek “atomos”)

Chapter 4 Atomic Structure p. 101. Section 4.1 Defining the Atom Greek philosopher Democritus Greek philosopher Democritus suggested atoms (Greek “atomos”)

Section 1: The Components of Matter - core.ac.uk · z The word "atom" is derived from the Greek word "atomos", meaning indivisible. z The philosopher Democritus (460-370 B.C.) believed

Section 1: The Components of Matter - core.ac.uk · z The word "atom" is derived from the Greek word "atomos", meaning indivisible. z The philosopher Democritus (460-370 B.C.) believed

II. History of atomic structure A. Democritus – 500 BCE Theorized that matter is composed of small, indivisible particles = ATOMOS (Greek for indivisible)

II. History of atomic structure A. Democritus – 500 BCE Theorized that matter is composed of small, indivisible particles = ATOMOS (Greek for indivisible)

PreAP Chemistry Chapter 3. Democritus was the early Greek philosopher who is credited with the concept of the atom (atomos) –which means invisible.

PreAP Chemistry Chapter 3. Democritus was the early Greek philosopher who is credited with the concept of the atom (atomos) –which means invisible.

ATOMS, MOLECULES AND IONShaydukscience.weebly.com/uploads/2/0/9/7/20974360/... · Democritus theorized that matter was built of ‘tiny indivisible particles’called atomos but this

ATOMS, MOLECULES AND IONShaydukscience.weebly.com/uploads/2/0/9/7/20974360/... · Democritus theorized that matter was built of ‘tiny indivisible particles’called atomos but this