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I. Atoms and Elements. A. Atoms and Elements. 1. Atom a. the smallest unit of an element that still has the properties of that element . b. Proton: positive; Electron: negative; Neutron: neutral. 2. Element a. the simplest form of matter because it contains only one type of atom.

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a atoms and elements
A. Atoms and Elements
  • 1. Atom
    • a. the smallest unit of an element that still has the properties of that element.
    • b. Proton: positive; Electron: negative; Neutron: neutral
slide3

2. Element

    • a. the simplest form of matter because it contains only one type of atom.
        • Example: carbon, oxygen, iron, hydrogen
slide4

2. Periodic Table

    • a. Chart scientist use where the elements are arranged in order of atomic number. Atomic number increase as you move across a row and down a column.
b molecules and compounds
B. Molecules and Compounds
  • 1. Compound
    • a. A substance made of atoms for two or more elements that have been combined chemically.
      • Example: H2O= Water
  • 2. Molecule
    • a. Smallest unit of compound that can exist in nature.
c physical properties
C. Physical Properties
  • 1. Physical properties
    • a. Traits that describe a substance.
      • Example: fur is soft, wood is solid
    • b. Solubility is also a trait (solubility is the ability to dissolve)
  • 2.Mixture
    • a. Combination of two or more substance in which the substances themselves aren’t

changed.

      • Example: sand at the beach is

a mixture of rocks, broken

shells, and other materials.

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