Science Module. 8 th Grade. TEKS 8.8 A and B. The student knows that matter is composed of atoms. The student is expected to: describe the structure and parts of an atom; and identify the properties of an atom including mass and electrical charge. Objectives.
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The student knows that matter is composed of atoms. The student is expected to:
Because atoms are so small and strange to us, we represent them by models. The following activity on modeling brings to light some of the limitations of models.
Activity in Chapter One on making models
Cut a piece of paper in half as many times as you can.
Paper Cutting Link
The “Black” box activity is important on several levels:
Who knew? is an activity designed to help students understand how science is built upon the investigations of previous scientists and determined in large part by the technology available.
The animation explains how theory of the atom moved from the Bohr model to the modern theories. It also shows the position and structure the atom and its components.
Atomic Theory Animation
This animation shows the Scanning Tunneling Microscope (STM) mapping atomic clouds in the silicon material. The STM uses a needle with a single atom on the tip to “see” the silicon atoms by their charged electron clouds.
The atom is composed of mostly empty space.
Atomic Field Video
Electrons are very small compared to a proton.
If the proton were the mass of an automobile, the electron would have the mass of a bag of potato chips.