Modern Physics The Atom.

Slides:

Advertisements

Similar presentations

Democritus Dalton 3. JJ Thomson 4. Rutherford 5. Bohr 6. Chadwick

Advertisements

ATOMIC STRUCTURE AND HISTORY

THE ROAD TO THE ATOM.

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.

1 This is Jeopardy Atomic Theory 2 Category No. 1 Category No. 2 Category No. 3 Category No. 4 Category No Final Jeopardy.

Particles, Nuclei, and Isotopes

The Changing Models of the Atom

Atomic Model History.

History of the Atom. What do you know about the atom? Put simply, the atom is the smallest particle of pure essence. For example, helium gas is made up.

The History of the Atomic Model Journey into the Unseen.

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.

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

The Changing Model of the Atom. Aristotle 400 BCE claimed that there was no smallest part of matter different substances were made up of different proportions.

 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.

Radioactivity and the nucleus

The History of the Atom.

Aim: How can we describe the structure of an atom?

Atomic Structure Scale of the Universe.

4.1 NOTES The History of the Atom

Models of the Atom a Historical Perspective

ATOM Rich -Paradis Early Thoughts Aristotle-- Continuous theory

HISTORY OF THE ATOM AND ATOMIC THEORY

Structure of the Atom Chapter 4.

Theories of the Atom.

Atomic Structure and development of the atom

Atomic Structure Ch. 3.

History of the knowledge of the atom

Is this really what it looks like?

Atomic Theory Nucleus 2s orbital p orbitals

Models of the Atom a Historical Perspective

1.3 History of the Atom Objectives 3:a,c,d; 5

Models of the Atom a Historical Perspective

DO NOW Pick up notes handout

Models of the Atom S Investigate the historical progression of the atomic model. Include: Dalton, Thompson, Rutherford, Bohr, quantum model.

The Development of the Theory on the Atom

Starter Activity Draw what you think an atom looks like and for extra CHALLENGE, label each part of the atom with its name and charge Current, Magnetic.

Atomic Models History of the Development of

Models of the Atom a Historical Perspective

The Missing Manual of Historical Figures

Models of the Atom a Historical Perspective

1.3 Atomic Theory.

Models of the Atom a Historical Perspective

Developing atomic theory

Models of the Atom a Historical Perspective

The History of the Atom.

Models of the Atom a Historical Perspective

Discovering the Atom.

Do First Actions: Turn in yesterday’s electron, proton, and neutron practice if you did not get it stamped Questions: If a neutral atom has an atomic mass.

1.3 Atomic Theory.

History of the Atom.

Models of the Atom a Historical Perspective

BR: Get PT Sticker Study Periodic Table (PT) Sticker

Atomic Nuclear 1. Of or relating to an atom or atoms.

Atomic Structure.

Models of the Atom a Historical Perspective

Models of the Atom a Historical Perspective

Models of the Atom a Historical Perspective

Matter & The Atom.

Building blocks of matter

Atomic Theories.

Models of the Atom a Historical Perspective

Atomic Structure.

Who said the elements are earth, water, air, & fire?

Models of the Atom a Historical Perspective

Presentation transcript:

Modern Physics The Atom

What is physics really about Mechanics we look at interactions between bodies Electricity and magnetism we look at interactions between charges Waves and light are about the transfer of energy Mass Charge Energy

What is matter (the stuff around us) If you took a lump of matter, could you keep on dividing it in two or would you get to a piece so small that you couldn’t divide any further? The greeks deicded you couldn’t – they called the smallest particle an atom (the greek word for indivisible)

Aristotle The greeks thought all matter made of earth, air, fire and water Eg lead was a mixture of these so if you could change the mixture You could turn gold into lead!

1800 Compunds were known about Dalton came up with the idea that compounds were made up of atoms Lead and gold atoms different so could not change lead to gold

1910 Thompson came up with plum pudding model for the atom Knew about electrons (the plums) and said the dough was positive Matter is mass, charge and energy!

1911 – NZ’s Rutherford Gold foil experiment using alpha (+) particles (He nuclei) fired through very thin gold foil onto a zinc sulfide screen Most particles went straight through but some scattered through a large angle

The details Rutherford considered The large scattering of the alpha (+) particles suggested there was a large + charge at the centre of a gold atom Gold is neutral so the electrons must be small and orbiting The atom must be mostly empty space

1913 - Bohr Bohr put the electrons into energy shells around the nucleus Chadwick discovered the neutron in the nucleus The model of the atom took 2000 years to design and we have had it about 70 years!

The atom is really more complex But for Year 12 Physics – we don’t care!

Atomic notation Element symbol Atomic number – give the number of protons in the nucleus and therefore the number of electrons in neutral atom Mass number – how many particles in the nucleus

Isotopes – very important to nuclear physics They are atoms that have the same number of protons but different numbers of neutrons Heavier isotopes of an atom are unstable and are the most likely to decay or be involved in nuclear reactions