Atom : The smallest particle of an element that keeps all the properties of that element. Lesson: Old Dead Guys.

Slides:

Advertisements

Similar presentations

Atomic Theory Timeline

Advertisements

The Structure of an Atom

Have a Periodic Table & a calculator per group!.  The mass number.

History of the Atom.

A History of the Atom A long time to study a little thing.

Chapter 4 Atomic Structure

Have 1 Periodic Table per group!.  The mass number.

ATOMIC STRUCTURE AND HISTORY

Atomic Structure. What is an Atom? The smallest part of an element.

Atomic Theorists How we got to where we are now. Law of Conservation of Mass Matter can’t be created or destroyed Who: Antoine Lavoisier When: 1785 Where:

Ancient Greece Democritus: .

Democritus (460 BC-350BC) was a Greek philosopher who thought that all matter was made of tiny indivisible particles he called atomos.

History of Atomic Theory

Atomic Structure History of Atomic Theory. Democritus ( BC) Was the first person to come up with the idea of atom Believed that all matter was.

Chapter 3 Atoms and Atomic Structure Write the bullets that are in black font.

AP Chemistry – Chapter 2 Atoms, Molecules and Ions.

Chapter 5: Atomic Theory Mr. Albaugh

Development of our understanding of the atom. Early Models Democritus was first to suggest atom in 4 th century B.C. Believed matter was made of tiny.

History of Atomic Theory

History of Atomic Structure

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

Atomic Structure History and Theories. The Greeks 4 th century B.C. Democritus “Atomists” school of thought Matter is composed of tiny indivisible particles.

TITLE The Development of Atomic Theory. Early Ideas Democritus—Greece 400 B.C. His idea:  There was a limit to how far you could divide matter. You would.

Atomic Structure. Way Early Theories Democritus ( BC) –First person to propose that matter is not infinitely divisible –Atomos –Matter is empty.

HISTORY OF THE ATOM. Aristotle 400 BC 400 BC - Claimed that there was no smallest part of matter - Claimed that there was no smallest part of matter -

What is an atom??? An atom is the smallest particle of an element that retains its identity in a chemical reaction.

Atomic Theory 15,000 kilotons.  Dismissed idea of the atom. Early Greeks Two schools of thought:  Matter is made of indestructible particles called.

Early Atomic Models Democritus –World is made of two things: empty space and indivisible particles, called atoms –There are different atoms for every material.

What is an _________? The smallest particle of an ________ that is still an ________ _________ are the building blocks of all ___________.

Atomic Model History.

The Historical View of Atomic Structure Continued.

1.3 Atomic Theory 1. John Dalton’s atomic theory - Matter is made up of small particles called atoms - Atoms cannot be created, destroyed or divided.

History of Atom Flip Book

ATOMS PROJECT CKS ATOMISM Atomism is the theory that all the objects in the universe are composed of very small, indestructible building blocks. Atomism.

Chapter 4 Atomic Structure.

History of the Atom Democritus Democritus: It was 400 BC when he came up with the idea that matter could not be divided indefinitely. This lead to the.

Atoms and their structure Labs n Labs are now online is a Google Docs folder n You can view the lab if you lose it (and you can copy and paste the procedure.

Law of Conservation of Mass Who: Antoine Lavoisier Matter can't be created or destroyed When: 1785 Where: France.

Atomic Structure.

Atomic Theory The Who’s Who of Atoms. Democritus ~460 BCE. Defined atom as the “smallest bit of matter. 100 years later, Aristotle dismissed his idea.

The Atomic Theory Democritus Dalton 440 B.C. – Thought matter was made of tiny particles – Believed these particles could not be cut into anything smaller.

The Atom. Dalton’s Atomic Theory 1.Elements are made of tiny particles called atoms. 2.All atoms of a given element are identical. 3.The atoms of a given.

What do I need to know for the test?. 460 BC-created the 1 st Atomic Theory of Matter (not modern atomic theory however) HIS THEORY Matter is composed.

Atomic Theory Democritus to Rutherford. Democritus - Ancient Greece w Philosophical question: Could matter be divided into smaller and smaller pieces.

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.

The History of the Atom. Aristotle  Aristotle was the first scientist that we have record of questioning what stuff was made of.  What did he think?

Chemistry Chapter 4 Notes #1 09/10/10. Democritus Matter is composed of empty space where atoms move Atoms are solid, homogenous, indivisible, and indestructible.

Chapter 4. Atom Smallest particle of an element that retains its chemical identity Atoms of the same element cannot be separated chemically because they.

Rev 6/7/ BC Atomic Model Development.

Atomic Theory and Structure of the Atom. first to suggest the existence of atoms believed atoms were small indivisible particles Atom: smallest particle.

+ ATOMIC THEORY. + Democritus Atom He was said to be the first step toward the current atomic theory. Hypothesized all matter is composed of tiny particles.

The Beginning of the Atomic Theory Democritus was a Greek philosopher who was among the first to suggest the existence of atoms. 460 BC – 370 BC.

Atomic Theory. Atomic History Ancient Greeks John Dalton JJ Thomson Ernest Rutherford James Chadwick Neils Bohr Erwin Schrödinger.

Introduction to Atomic Structure. Dalton’s Atomic Model (early 1800’s) Matter made of atoms Matter made of atoms All atoms of given element are identical.

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

Scientists The atom. Democritus BC- Greek philosopher - No experimenting -Matter made up of indivisible particles = “atomos”

Ch 5: Atomic Structure. warmup All matter is composed of very small particles called atoms. In middle school science you learned about the atom. 1. Draw.

History of the Atomic Theory An atom is the smallest particle of an element that retains its identity in a chemical reaction. Our current theory of the.

Atomic Theory and Developing an Atomic Model

Chapter 3- Atomic Structure

Research Hypothesis Theory An educated guess based on an observation

Early History of the Atom

The atom Chapter 4.

Atomic Structure.

Presentation transcript:

Atom : The smallest particle of an element that keeps all the properties of that element. Lesson: Old Dead Guys

Dalton’s Theory (Postulates) All matter made of tiny particles called atoms All atoms of the same element are the same Atoms can’t be created or destroyed, or divided into smaller parts Different atoms combine to make compounds Atoms are rearranged during chemical changes

JJ Thomson Cathode Ray Tube experiment Found out the glowing beam in the tube had a negative charge Discovered electrons

Thomson’s Theory: Electrons are spread out in a large positive mass. Called the Plum Pudding Model

Rutherford’s Gold Foil Experiment Fired particles at gold foil Some particles bounced back Why? Because of the dense central nucleus

This is Thomson’s idea of an atom. Rutherford thought all the particles would pass straight through the atoms. This is what Rutherford found out: There is a dense nucleus in the middle of the atom.

But what stops the electrons from joining the nucleus? Positive and negative attract… Rutherford’s Model

Bohr’s Model The electrons must be in energy levels, orbiting around the nucleus. The electrons can change energy levels depending on their energy Planetary Model

Millikan’s Oil Drop Exp. Discovered the mass – to –charge ratio of an electron