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I. Atoms and Elements

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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I. Atoms and Elements

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  1. I. Atoms and Elements

  2. 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

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

  4. 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.

  5. 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.

  6. 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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