4.1 Defining the Atom

Nov 19, 2014

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Early Models Democritus (about 400BC)- matter composed of tiny, indivisible particles. 4.1 Defining the Atom. Dalton (about 1800)- - used scientific method transformed Democritus’ ideas into theory. 4.1 Defining the Atom. Atoms of element A are identical.

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4.1 Defining the Atom

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The Atom

The Atom. Matter. Is anything that has weight and takes up space. All matter is made of atoms. Atom. Since the atom is too small to be seen even with the most powerful microscopes, scientists rely upon models to help us to understand the atom.

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Defining the Atom

Defining the Atom. All matter is composed of atoms Atoms are the smallest particle of an element that retains its identity in a chemical reaction. Atom comes from the Greek word atomos meaning indivisible. Powerpoint hosted on www.worldofteaching.com

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The Atom

The Atom. Chemistry Vocabulary and notes. Vocabulary - 1. Element - substance that cannot be broken down into other substances by chemical/physical means Atomic number- number of protons in nucleus Atomic mass unit (amu) -unit used to measure particles in atoms

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THE ATOM

THE ATOM. Unit 5 Chemistry Langley. ATOMIC TIMELINE. THE FIRST ATOMIC SCIENTIST. DEMOCRITUS (400 BC) First scientist to hypothesize that all matter was made of small particles Named the small particles atoms Atoms in Greek means indivisible

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Defining the Atom

Defining the Atom. Atomic Theory All matter is made up of very tiny particles called atoms Atoms of the SAME element are chemically alike The atoms of an element have a definite mass that is characteristic of the element

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THE ATOM

THE ATOM. Part 1. Pg 65-74. The Atom:. From Philosophy to Science. Think with me…about sugar crystals, you can see that they are small crystals and every crystal is identical . You may grind these particles into a very fine powder, but each tiny piece is still sugar.

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The Atom

The Atom. Section 4.1-4.3 Notes. History of Atomic Models. Democritus (~400BC) atomos = small, solid, indestructible particles of different shapes & sizes These were just ideas, not truly science… Dalton’s Atomic Theory Billiard Ball Model - small solid sphere

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Defining the Atom

Defining the Atom. Hadi Syed. History. In Ancient Greece a man named Democritus figured out that every single thing in the universe must be made up of tiny particles that can’t be cut anymore He called these particles “atoms”, which in Greek means “ uncuttable ”. What is an atom?.

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The Atom

The Atom.

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The Atom

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The Atom. Smallest particle of an element that retains the properties of the element. The beginning. Democritus first suggested the existence of atoms in the 4 th century BC. John Dalton was the first to perform scientific experiments to test and correct his idea of the atom.

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The Atom

The Atom. How big are subatomic particles in relationship to one another and to the whole atom? Where are the subatomic particles located within the atom? What are the charges of the subatomic particles? Which atomic theory is most current?

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The Atom

The Atom. What is an Atom?. Atom : Smallest unit of all matter 3 Main Parts: 1) Proton (+ charge) 2) Neutron (No charge) 3) Electron (- charge) Protons & Electrons usually equal in number Elements (substance made of only 1 type of atom) are identified on the Periodic Table.

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The Atom

The Atom. An Atom Is So Small…. A penny contains 2 x 10 22 atoms Or 20,000,000,000,000,000,000,000 atoms! It would take a stack of 50,000 aluminum atoms to equal the thickness of a sheet of aluminum foil!. What’s Inside an Atom. BrainPOP Atom.

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The Atom

The Atom. Counting. The Atom- September 5. Pick up a Chemistry textbook from the shelf Take out one piece of notebook paper, write your name, date, and title it Chapter 3 Review Pass your Progress Reports to the middle isle Chapter 3 Test Tomorrow!. Chapter 3 Test Review. Textbook p. 89-90

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Defining the Atom

Defining the Atom. Democritus. 460B.C. – 570 B.C. Termed the name atom from the Greek word “atomos”. Philosopher If you break down an object you will eventually reach a point where you can not break it down any further. He called the smallest unit “atomos”. John Dalton.

1.43k views • 117 slides

Defining the Atom

Defining the Atom. Atoms are TINY! One penny contains 2.4 x 10 22 atoms Earth’s population = 6 x 10 9 people Radius of one atom is about 1 x 10 -10 m What is inside the atom?. Reviewing the Atom. What is our current model of the atom?. How did all this information come about?.

959 views • 57 slides

The Atom

The Atom . The Atomic Number = number of protons ( = number of electrons in neutral atom) The Mass Number = Number of protons + number of neutrons. Isotope = atoms with same atomic number but a different mass – different number of neutrons. Radioactivity .

387 views • 28 slides

The Atom

The Atom. Two major parts of an atom. Nucleus (not to scale). Electron Cloud. Three Major Sub-Atomic Particles. Protons Neutrons Electrons. p +. THE PROTON. Heavy = 1 amu Positive + 1 charge Location: Nucleus. . N °. THE NEUTRON. Heavy = 1 amu

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The Atom

The Atom. Atomic Clock Atom Bomb Atom Ant. What Do You Think?. Draw a diagram of what you think an atom looks like. Are atoms mostly Empty space Stuff Equal parts of each. Challenge Question. Atoms are mostly … ______________________________________. Connection.

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The Atom

The Atom. History and Structure. The Atom. Objectives Summarize the observed properties of cathode rays that led to the discovery of the electron Summarize the experiment carried out by Rutherford and his co-workers that led to the discovery of the nucleus

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