Subatomic Particles protons, neutrons and electrons.

Slides:

Advertisements

Similar presentations

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

Advertisements

Chapter 4 Lecture Basic Chemistry Fourth Edition Chapter 4 Atoms and Elements 4.3 The Atom Learning Goal Describe the electrical charge and location in.

From Philosophical Idea to Scientific Theory

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

The structure of the atom

Democritus – 460 – 370 BC p. 101 Matter consisted of tiny particles “atomos” Ideas were wrong P. 122 – Q - 35.

Atomic Theory and the Atom

Chapter 4, Section 2 Sub-Atomic Particles and Nuclear Atoms.

Atomic Theory Atoms are incredibly small!

Honors Chemistry Chapter 4 The Structure of the Atom.

Early Theories & Subatomic Particles ( )

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.

Chapter 5 Review. Atomic Theory/Scientists Who was the first person to theorize the existence of the atom in 400 BC? Who was the first person to theorize.

Chapter 4 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.

Subatomic Particles Dalton, Democritus & other early chemists thought the atom was a homogeneous particle. Static electricity between objects made scientists.

The Parts of an Atom.

FAMOUS SCIENTISTS ATOMIC MASS ATOMIC NUMBER ATOMIC.

Chapter 4: Atomic Structure

EARLY Atomic theories.

standards: 1e, 1h terms: 92 mastering concept: 112 (34-46) Homework Cornell notes: 4.2 sec. assessment: 97(6-8) 1.

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

Section 2: Atomic Discoveries

Section 3.3 Atomic Structure Dalton described the atomic nature of matter – is that the end of the story?

The Historical View of Atomic Structure Continued.

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

History of Atom Flip Book

The History of the Atom Part 2 – The discovery of subatomic particles When we last left the atom, it looked like this:

Ch. 4: Atomic Structure 4.1 Defining the Atom. History  Democritus named the most basic particle named the most basic particle atom- means “indivisible”

Section 4.2 Defining the Atom.

The Structure of the Atom

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

The Structure of an Atom

HISTORY OF THE ATOM MODERN THEORIES OF ATOMIC STRUCTURE.

1 Atomic Theory The Atom Copyright © 2008 b Pearson Education, Inc. Publishing as Benjamin Cummings.

Atomic Structure Chapter 4. Dalton’s Atomic Theory 4.1 John Dalton – 18 th century All matter is composed of atoms All atoms of a given element are identical.

D. Subatomic Particle & the Nuclear Atom 1.Nucleus contains positively charged protons and neutral neutrons VERY dense! If a nucleus were the size of the.

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.

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

1 Chapter 4 Atoms and Elements 4.3 The Atom Basic Chemistry Copyright © 2011 Pearson Education, Inc.

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.

Discussion: Three Atomic Models of the Atom. Some people believe that theories never change. That isn’t true. Theories change until we get it right. The.

Inside The Atom 8 th 2.1 The Story of the Atom. The Story of the Atom Element – substance that cannot be broken down into simpler substances Element –

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.

CP Chemistry Chapter 8 Atomic Theory Subatomic Particles Protons Protons Neutrons Neutrons Electrons Electrons.

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

Chemistry  Dalton’s theory proven in experiments for almost 100 years  J. J. Thomson’s discoveries in 1897 showed atoms were NOT indestructible.

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

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.

THE STRUCTURE OF THE ATOM.  All atoms consist of 2 regions:  1) Nucleus: very small region located near the center of the atom  Proton: positively.

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.

{ Atom and Isotope Review Physical Science. An atom has 6 protons, 8 neutrons, and 6 electrons. What is the atomic mass?

The Structure of the Atom Chemistry – Chapter 4. Early Theories of Matter Philosophers ◦ Democritus was first to propose Atomic Theory:  Matter composed.

Atomic Structure.

Section 4.2 Defining the atom. The Atom What we know now: Definition: Atoms are the smallest particle of an element that retains the properties of that.

4.3 The Atom An atom is the smallest particle of an element that retains the characteristics of that element. Aluminum foil contains atoms of aluminum.

Lecture 15 The Atom Ozgur Unal

Atomic Structure Structure of the Nuclear Atom

Test 4: Chapter 4 – Atomic Structure

The Development of the Atomic Theory

Warm-Up Draw a picture of an atom. Be as specific as you can!

The Development of the Theory on the Atom

Discovery of the Atom.

Atomic Structure Ch. 4.

4.1 & 4.2 Early Theories & Subatomic Particles

Chapter 4 Atoms and Elements

The Structure of the Atom

Presentation transcript:

Subatomic Particles protons, neutrons and electrons

Cathode Ray Tube Tube used to study the relationship between mass and electric charge Cathode = negative; anode = positive Crookes and radiation from cathode to anode Led to the development of the t.v. and computer

Dalton’s atomic theory proven wrong… Atoms are divisible into smaller subatomic particles Thomson discovers the first subatomic particle – electron!

The Charge of an Electron Discovered by Robert Millikan Mass = 9.11 x grams Led to several questions: Where does the rest of the mass of the atom come from? How is all matter neutral if electrons are part of all matter and electrons have a negative charge?

Plum Pudding? Thomson – electrons distributed throughout a uniform positive charge

Gold Foil Experiment and the nucleus Ernest Rutherford Gold Foil Experiment disproves plum pudding New model – atom is mostly empty space through which electrons travel Tiny, dense nucleus containing the mass of the atom An atom the size of two football fields would have a nucleus the size of a nickel A mass of nuclei the size of a period would have a mass of 120 tons Positive charge of nucleus balances negative charge of electrons

Protons and Neutrons Chadwick discovers the neutron – mass equal to proton but does not carry a charge Atoms are spherically shaped with a tiny, dense nucleus of + charge surrounded by – charged electrons traveling through empty space surrounding the nucleus

Properties of Subatomic Particles ParticleSymbolChargeMassLocation Electrone -1 -1/1840 amu (0) Space surrounding the nucleus Proton p amuIn the nucleus Neutronn 0 01 amuIn the nucleus

Isotopes Atom with the same number of protons but different numbers of neutrons Change the # of protons = change the element Change the # of electrons = happens all the time Change the # of neutrons = change in mass number = isotope of the atom