PPT-Elements Atoms are the smallest part of an element.

For Example If you have a piece of gold and cut it into smaller and smaller pieces you would eventually reach a point where you couldnt cut the gold up any smaller That smallest piece would be an atom of gold. Section 4.2. Objectives. State the three . subparticles. of atoms. State the charges of the . subparticles. Describe the composition of an atom. Atom. Fundamental particles which make up matter. The smallest particle of an element that retains (keeps) its identity in a chemical reaction. Non metals and Metalloids. A non metal is an element that is not a metal and does not have properties of metals. A metalloid is an element that is not a metal but it is similar to a metal.. Physical properties of nonmetals: Most nonmetals are poor conductors of electric current and heat. Solid nonmetals tend to be dull and brittle.. Matter. Has Mass=. The Amount . of Matter. in an Object. “Stuff” that . Everything. is made of!. Made of . Atoms. Has Volume=. Takes Up . Space. Don’t Sweat the Small Stuff!. What is the “Small Stuff” anyway?. Please pick up the QOTD on the half-sheet of paper up front.. Do the questions on the half-sheet of paper. PLEASE HAVE YOUR HOMEWORK READY: pages 97-100. I . will check them now. . QOTD 10/30/13. 1. a. . Atoms. . are the smallest unit of matter. . Matter. . is anything that has mass and takes up space. . A . ball is matter, water is matter, even the air you breathe is matter!. What is an atom. ? (cont.). Law of Conservation of Mass. The . total mass of materials after a chemical reaction is the same as the total mass before the reaction.. . Law of Constant Composition. The . elemental composition of a compound is always the same. Atoms and Isotopes. What you need to know about Atoms . and Isotopes:. Matter. Molecules. Elements. Chemical reaction. Periodic Table. The Atom. Parts of an atom. Isotopes. Unstable isotopes. Scientists and discoveries. Lesson 1: What is matter made of?. Standards: . S5P1: Students will verify that an object is the sum of its parts.. S5P2: Students will explain the difference between a chemical change and a physical change. . name #_______. date_______. . ____________. Block #___. A test of a hypothesis under conditions established by a scientist is called a. and Ions. Jim Geiger. Cem 151. Atomic Theory of Matter. The theory of atoms:. Original to the Greeks. Leuccipus, Democritus and Lucretius. (Aristotle thought they were nuts). He believed that one could divide up a piece of matter an infinite number of times, that is, one never came up with a piece of matter that could not be further divided. He suggested that everything in the world was made up of some combination of four elements: earth, fire, water, and air. The elements were acted upon by the two forces of gravity and levity. Gravity was the tendency for earth and water to sink, and levity the tendency for air and fire to rise.. Examples:. Hydrogen. Carbon. Chlorine. Titanium. Atom. Democritus (450 B.C.). If . you kept cutting a substance in half forever, eventually you would end up with an “. uncuttable. ” particle. . John Dalton (1800). Early in the 19. th. century John Dalton developed atomic theory. His theory explained the best available experimental data at that time. His theory has been modified since then with the discovery of other data, but his work was the initial ground work that we will examine first.. excludes synthetic minerals. inorganic. non living processes form them. chemically specific. has a unique proportion of elements. crystalline solid. atoms are arranged in specific 3-D patterns. Definition:. DE Chemistry. Dr. Walker. Timeline. B.C.. 400 B.C. . Demokritos. and . Leucippos. . use the term ". atomos. ” . 1500's. Georg Bauer: systematic metallurgy. Paracelsus: medicinal application of minerals.