The Atom Pg. 29. Early Theories There was no experimentation Democritus- atoms are solid, homogeneous, indestructible, and indivisible Aristotle- believed.

Slides:

Advertisements

Similar presentations

History of Atomic Structure

Advertisements

The Structure of an Atom

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

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

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:

The History of the Atom.

Atomic Theory and the Atom

Atomic Theory Atoms are incredibly small!

THE STRUCTURE OF ATOMS Pg. 43. Daily science- pg. 40  Who discovered the neutron? Electron? Nucleus?  What did Democritus theorize?  Name two differences.

History of Atomic Theory

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.

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

Atom Models From Democritus to Bohr’s.

Unit: Atomic Structure

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 Parts of an Atom.

EARLY Atomic theories.

Particles, Nuclei, and Isotopes

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

Section 1- Discovering the parts of the atom

Development of Atomic Structure How long have people been interested in understanding matter and its structure? A.Thousands of years B.Hundreds of years.

The Structure of the Atom

The Changing Models of the Atom

Review Scientist who discovered the electron using the cathode ray tube –Thomson Scientist who used the oil drop experiment to discover the charge on the.

Atomic Structure. 1. Democritus: Around 300 BC, a Greek philosopher, Democritus stated that everything is made up of tiny, invisible particles He said.

Early Atomic Theory LG: I understand how the understanding of the atom has changed over time and the experiments that lead to these changes.

The Historical View of Atomic Structure Continued.

History of Atom Flip Book

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.

The Atomic Theory of Matter By Shaffer Lisle. The First Theories John Dalton’s proposed theories: Each element is composed of particles called atoms.

The Structure of the Atom Chapter 3 Chemistry: Matter and Change.

Daily science- pg. 30  Create a table like the following on page 30 in your notebook. Label this page History of the Atom. Leave a few lines for each.

How do we know about atoms?

Development of Atomic Theory Ancient Times | Dalton's Postulates | Thomson's Discovery of Electron Properties | Rutherford's Nuclear Atom | Bohr's Nuclear.

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

The Structure of an Atom

Chapter 5: Atomic Structure. Early Models of Atoms Democritus ( B.C.) first suggested the existence of these particles, which he called “atoms”

Describe the mass, charge, and location of protons, neutrons, and electrons in atoms. S-105.

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 Development of a Modern Theory of the Atom Aristotle Democritus.

History of the atom. Atoms (created by the Big Bang) are the smallest unit that makes up matter.

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

1.3 Early Models of the Atom pp Ancient Models of the Atom Democritus: he stated that there must be a smallest particle, which he called an.

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.

Atoms, Molecules, and Ions Teacher Instructions: Go to Login: edhpop Password: edhpop1 Go to Science Go to “Matter and.

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.

Rev 6/7/ BC Atomic Model Development.

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.

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

Chapter 5: Atomic Structure and the Periodic Table.

Subatomic Particles protons, neutrons and electrons.

Atomic Theory 1. The Atom 2 Early Theory Democritus (400 BC) thought the world was made of tiny indivisible particles Aristotle believed that all matter.

Greek Philosop hers Dalton’ s Atomic Theory How atoms differ Radioac tivity Types of radiatio n The atom Subatomic.

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

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.

SAT VOCABULARY analogous (adj.) analogous (adj.) similar to, so that an analogy can be drawn dynamic (adj.) dynamic (adj.) actively changing; powerful.

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.

History of the Atom and Periodic Table.  Around 400 B. C., Democritus claimed all matter was made of tiny, indivisible particles called “atoms”.  Aristotle.

Chapter 3: Discovering the Atom and Subatomic Particles

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

The Development of the Atomic Theory

DO NOW Pick up notes handout

The Development of the Theory on the Atom

Atomic Structure Ch. 4.

Daily Science Sept 28 Grab a piece of construction paper and make a new unit tab over pages 30 and 31. The new unit is: ATOMS AND THE PERIODIC TABLE If.

4.1 & 4.2 Early Theories & Subatomic Particles

Atomic Structure Chapter 4.

Presentation transcript:

The Atom Pg. 29

Early Theories There was no experimentation Democritus- atoms are solid, homogeneous, indestructible, and indivisible Aristotle- believed everything was made of either fire, water, earth, or air. John Dalton- all matter composed of atoms; all atoms of one element are identical; atoms can’t be created or destroyed (actually used experiments)

Evolution of the Atomic Theory The electron- discovered by JJ Thomson using a cathode ray tube; Robert Millikan discovered the negative charge JJ Thomson came up with the plum pudding model. An atom was a mass ( pudding) with electrons scattered throughout (plums) Ernest Rutherford discovered the nucleus using the gold foil experiment; said atom is mostly empty space with dense positive nucleus in the middle

Evolution of the atomic theory Rutherford did more experiments and concluded the proton was in the nucleus James Chadwick- discovered a neutral particle in the nucleus called the neutron Atom- smallest particle of an element that still retains that elements properties

BEHOLD! An atom is born Atom is spherical with a lot of empty space where electrons (with little mass) exist. In the middle, there is a small dense nucleus (contains most the mass)that contains positively charged protons and neutral neutrons

Atomic Number The periodic table can be used to find the number of protons, electrons, and neutrons. The atomic number of an element (labeled Z) tells you how many protons there are. On the periodic table, the elements are listed as neutral elements so the number of electrons=the number of protons.

Z

Calculating # of neutrons The mass number (labeled A) is the number of neutrons + protons. Mass number=atomic mass rounded to the nearest whole number The atomic mass is located under the element symbol. You can find the number of neutron by subtracting the Atomic number (Z) from the Mass number (A) A-Z = # of neutrons

Shorthand notation There is a way to represent atomic mass and number Steps: –1-start with the element symbol –2- place the mass number on the top left side of the symbol –3-place the atomic number on the bottom left side of the symbol

Al 27 13