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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


  • 2. Element

    • a. the simplest form of matter because it contains only one type of atom.

      • Example: carbon, oxygen, iron, hydrogen


  • 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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