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CHAPTER 18 ATOMS AND ELEMENTS Section 18.1 Atomic Structure
All matter is formed from atoms, either by themselves or combined in molecules. Everything that you … see hear touch smell taste
Atoms are tiny. 100 trillion atoms are in one body cell. A dust speck has many more atoms than that.
What do you find when you break apart an atom? Most atoms contain three subatomic particles: Protons Neutrons Electrons
Atoms nucleus contains protons and neutrons. Electrons move in space around the nucleus.
Electrons exact location cant be determined at any one time. Shaded area around outside of atom represents places electrons might be.
ParticleCharge Mass (amu) Electronnegative 1/1840 Protonpositive1 Neutronneutral1 Subatomic particles have charge and mass.
How big are atoms?
Greek philosophers proposed an atomic theory around 400 BC. Atomic theory states that all matter is made of tiny particles called atoms.
Democritus (Greek philosopher) proposed that matter is made of small particles called atoms, from the Greek word atomos, meaning indivisible.
John Daltons Atomic Theory (1808) 1. Elements made of atoms. 2. Atoms of given element are identical. 3. Atoms of different elements are different. 4. Atoms not changed by chemical reactions.
Daltons Model, cont. 5. Compounds formed by joining elements. 6. Compounds defined by number, type, and proportion of atoms. Billard ball model
- discovered electrons (negative charge). - knew that atoms were neutral, so proposed that the atom was positive sphere with negative electrons embedded in it. Joseph John Thompson (1904)
Thomsons model Watermelon or plum pudding model
- conducted gold foil experiment. -hypothesized that atoms are mostly empty space. -suggested that center had a tiny core called a nucleus. Ernest Rutherford (1911)
Niels Bohr ( ) conducted experiments to update Rutherfords model.
-Said that electrons move around the nucleus in fixed orbits that have a set amount of energy. Bohr model, cont. Planetary model
James Chadwick (1932) Discovered neutron
Electron cloud model Current model of the atom. Cloud represents probable location of an electron.
History of Atomic Structure. Aristotle Democritus.
Atomic Models Through Time. B.C. Theorized that if you were to cut something in half, then cut it in half again and again… Eventually.
Atomic Theory Timeline Development of our understanding of the atom.
ATOMIC THEORY Honors Chemistry Chapters 3 & 4 Topics of Discussion Summarize the Development of Atomic Theory Examine Atomic Structure.
Chapter Atoms Democritus (460 BC – 370 BC) first suggested the idea of atoms Indivisible and indestructible.
History at a Glance Early Models Early Philosophers and scientist could not observe individual ideas but were still able to propose ideas about the structure.
The Structure of an Atom Chapter 3. Early Theories Greek Philosophers –4 Elements Earth Fire Wind Water –Democritus Atoms make up matter –Aristotle.
Holt McDougal Chapter 4 Section 2. Explore the scientific theory of atoms (also known as atomic theory) by describing the structure of atoms in terms.
Physical Science Chapter 18 – Properties of Atoms & the Periodic Table The Elements: Forged in Stars The Origin of the Elements.
Early Atomic Theory and the Structure of the Atom Chemistry.
Chapter 2 Atoms and their structure. History of the atom Original idea of the atom: Ancient Greece (400 B.C.) n Greek philosophers Democritus and Leucippus.
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Elements & Atoms Atomic theory grew as a series of models that developed from experimental evidence. As more evidence was collected, the theory and models.
ATOMIC STRUCTURE, NUCLEAR CHEMISTRY & UNIT 6 He asked this question: If you break a piece of matter in half, and then break it in half again, how many.
Section 4–2: The Structure of an Atom Coach Kelsoe Physical Science Pages 108–112.
The History of Atomic Theory Mr Nelson. Democritus The Greek philosopher Democritus began the search for a description of matter more than 2400 years.
MODELS OF ATOMS ÞDemocritus(400 B.C): said that matter is composed of indestructible particles. He called them atoms, a Greek word which means indestructible.
Chapter 4 Atomic Structure Pre-AP Chemistry Charles Page High School Stephen L. Cotton.
Atoms Journal 41) Copy the standards (page 118) 8.3. with a with a. b. and c. Class discussion will follow: think about what you already know about.
UNIT 1: CHEMISTRY Grade 9 Science. Unit 1:Chemistry Chemistry=> The scientific study of matter, its properties and interaction with other matter.
Atomic Structure and Theory Scientists Experiments D E t.
I. Structure of the Atom The Early Models of the Atom.
Atoms, Atoms Everywhere! Atoms, Atoms Everywhere! The History of Atomic Models.
Atoms Chapter 2, Section 1. The Building Blocks of Matter Matter Anything that: has mass takes up space.
Chapter 4 Atoms and their structure History of the atom n Not the history of atom, but the idea of the atom. n Original idea Ancient Greece (400 B.C.)
Mr Nelson. The Greek philosopher Democritus began the search for a description of matter more than 2400 years ago. He asked: Could matter be divided.
The History of Chemistry Eleven big ideas Chemistry Mr. Bimber.
Atoms, Molecules, and Ions HOMEWORK n Read your textbook pages 74 to 78 and answer q 1 to 6 n Start a timeline in your notebook of the discoveries that.
GO 3 Describe ideas used in interpreting the chemical nature of matter, both in the past and present, and identify example evidence that has contributed.
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