Atomic Theory Democritus – Continuous Theory Separate, discrete particles Cannot be further divided Called them Atoma Atom came from it Law of definite.

Slides:

Advertisements

Similar presentations

Atomic Theory Timeline

Advertisements

Atomic Theories.

Models of the Atom a Historical Perspective

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

ATOMIC STRUCTURE AND HISTORY

THE ROAD TO THE ATOM.

Development of Atomic Theory

Dual Nature of Light. Light Quanta. Photoelectric Effect.

HIROSHIMA 1945 August 6 th, 1945 ATOMIC THEORY Part 1: Atomic Structure.

Atomic Physics.

AIM: Models of the Atom DO NOW:

Learning Standards Atomic Structure Broad Concept: Atomic models are used to explain atoms and help us understand the interaction of elements and compounds.

Theory of Atomic Structure

11 Atomic Theory. 2 A HISTORY OF THE STRUCTURE OF THE ATOM.

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.

Atom Models From Democritus to Bohr’s.

Chemistry: Matter and Chemical Bonding Early Atomic Theories.

The Parts of an Atom.

Chapter 4: Atomic Structure

EARLY Atomic theories.

The History of the Atom…. went against, Aristotle, who believed that matter was composed of four qualities: earth, fire, air and water all matter is composed.

Chapter 16: The Properties of Atoms and the Periodic Table

Atoms and the Periodic Table. What is an atom?  The Basic Building Block of matter.

Atomic Theory. Let’s Take a Trip Through Time! Atomic Theories Timeline Name DemocritusDaltonThompsonRutherfordBohrSchrödinger Heisenberg Time Frame.

Matter Unit Learning Goal #2: Summarize the major experimental evidence that led to the development of various models, both historic and current.

Atomic Theory Past and Present.

ATOMIC THEORY. History of the Atom  feature=related feature=related.

Models of the Atom a Historical Perspective simple atom structure atomic history song.

Mixtures – a combination of substances in which each substance retains its individual properties.

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

Atomic Theory. Let’s Take a Trip Through Time! Democritus 460 – 370 B.C. There are various basic elements from which all matter is made Everything is.

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 Chemical Behavior of Atoms Day 1. Curriculum  Big Idea: Atomic theory is the foundation for the study of chemistry.  Concept: Energy is absorbed.

Prentice Hall Physical Science – Chapter 4

Theory of Atomic Structure. Greeks – Democritus, Leucippus Over 2000 years ago All matter is composed of tiny particles These particles are so small that.

Matter & The Atom. Matter The term matter describes all of the physical substances around us: your table, your body, a pencil, water, and so forth.

The Development of the Atomic Theory. Dalton’s Atomic Theory founder of the atomic theory atoms in Greek means indivisible, indestructible 1.All matter.

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

Atoms and Their Structure Early Greek Theories 400 B.C. - Democritus crushed substances in400 B.C. - Democritus crushed substances in his mortar and.

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

The History of Atomic Theory. Democritus Greek philosopher 2400 years ago The Atom Could matter be divided into smaller and smaller pieces forever? Or.

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.

O We use models to help us understand things that are too: BIG small Fast s l o w or complicated to see in “real life”

Atomic Models From the ancient Greeks to the 20 th century.

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.

History of the Atomic Model

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.

Matter & The Atom. Matter The term matter describes all of the physical substances around us: your table, your body, a pencil, water, and so forth.

Chapter 4: Section 1.  The Atom is the smallest particle of an element.

Atomic Structure Notes. Thomson Model The “pudding” had a positive charge and the “plums” had a negative charge.

Models of the Atom. Ancient Greece 300 BC in Greece School of thought that matter is made up of tiny indivisible, invisible, indestructible, fundamental.

Historical Development of an Atom. Democritus B.C Democritus was a Greek philosopher ( B.C.) who is the father of modern atomic thought.

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 Models. Atomic Theories Atomic Theory – A Short History  Fifth Century, BCE  Democritus  Believed matter was composed of very small, individual.

Atomic Structure.  Democritus (460 BC – 360 BC)  Ancient Greek philosopher ▪ No experiments performed!  Major Contribution: The Atom ▪ He proposed.

History of Atomic Theory Figuring Out Atoms. Dalton’s Atomic Theory 1.Matter is composed of extremely small particles called atoms. 2.Atoms are indivisible.

History of the Atom From Democritus to Bohr. Democritus of Abdera Greek 4 th century BC. Democritus is known as the "Laughing Philosopher“because of his.

 Democritus  400 B.C. - thought matter could not be divided indefinitely  This led to the idea of atoms in a void  Aristotle  Believed that matter.

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

Democritus (460‐370 B.C.) First to propose the ultimate particle: “atom”

DEVELOPMENT OF THE ATOMIC THEORY Atom- smallest particle into which an element can be divided and still be the same substance Called the building blocks.

Atomic Theory Mr. Tollefson Chemistry Class. Introduction Students will be introduced to the atom and the development of the atomic theory from ancient.

ATOM Early Thoughts Greeks matter is made up of particles--4 elements 4 elements --air--fire--water- -- earth Aristotle-- Continuous theory Democritus.

UNIT 2 Atoms, Molecules, and Ions. 1. Each element is composed of extremely small particles called atoms. 2. All atoms of a given element are identical.

How did we learn about the atom?

The Development of Atomic Models: A Historical Perspective

Research Hypothesis Theory An educated guess based on an observation

Atomic Structure.

Presentation transcript:

Atomic Theory Democritus – Continuous Theory Separate, discrete particles Cannot be further divided Called them Atoma Atom came from it Law of definite composition Every compound is formed of elements combined in specific ratios by mass unique for that compound

Atomic Theory Dalton – 1803 Combinations of different atoms form compounds Atoms of different elements have different masses Made first atomic table Revised into periodic table of elements Dalton’s model foundation of modern atomic theory

Atomic Theory Thomson – Electron Discovery Cathode ray beam unaffected by gravity Must be wave Affected by magnetism Must be charged Drawn to positive charge – must be negatively charged particles Stoney called electrons

Atomic Theory Thomson – Plum pudding model Mass of charged particles almost nothing, but entire atom mass a lot more Negatively charged particles embedded in positively charged substance (pudding) that completely surrounds them – neutral charge

Atomic Theory Rutherford/Geiger and the Nucleus Alpha particles – mass of 7300 electrons Pass through gold foil, strike zinc sulfide, flash of light Some deflected, some ricocheted! They must be hitting something massive! atch?v=QY8w8xpKKzs atch?v=QY8w8xpKKzs

Atomic Theory Rutherford/Geiger and the Nucleus Later discovered that nucleus positively charged – named positive particles protons 1836 times more massive than electrons # of protons in nucleus Atomic number

Atomic Theory Chadwick and the Neutron Nuclei more massive than protons yet positively charged Must be neutral particles Particles named neutrons Electrons orbit much like planets

Atomic Theory Bohr-Electron energy levels Why orbits not decay? Heated elements produce spectra – lines of emissions Electrons exist in specific energy levels, as energy absorbed, move from one level to another (quantize) for short period, when return, emit light in specific spectra

Atomic Theory Bohr-Electron energy levels 6 or 7 levels per atom Spectra unique to each element Note the spectra, identify the element

Atomic Theory Modern Quantum Theory – DeBroglie’s Hypothesis Electrons orbit in waves – not continuous round motion Always complete wave, never partial

Atomic Theory Modern Quantum Theory - Heisenberg’s uncertainty principle Electrons orbit in 4 dimensions (time) their position at any point in time cannot be precisely determined! Orbit in clouds

Atomic Theory Physicist humor