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Science Module. 8 th Grade. TAKS Objective 3 . The student will demonstrate an understanding of the structure and properties of matter. 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

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taks objective 3
TAKS Objective 3

The student will demonstrate an understanding of the structure and properties of matter.

teks 8 8 a and b
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
Objectives
  • The learner will be able to describe the parts of an atom.
  • The learner will be able to compare mass and charges of the electron, proton, and neutron.
lesson objectives continued
Lesson Objectives “Continued”
  • The learner will use appropriate models and analogies to describe the size of an atom and its particles.
  • The learner will explain the development of the atomic theory.
misconceptions
Misconceptions

True or False

Electrons are little spheres

that orbit the nucleus of an atom

slide7
Electrons have no known shape and almost no mass. They do not orbit; they move randomly in an electron cloud.
slide8
True or False

Atoms are like miniature solar systems

slide10
True or False

The electron is the same size

as a proton or neutron

development of atomic theory
Development of Atomic Theory

440 BC - Democritus

first suggested the

existence of atoms

slide14
1803 - John Dalton suggested a 3-part atomic theory (1) everything is made of atoms (2) atoms combine to make new substances (3) atoms of the same element are alike
slide15
1897 – J.J. Thomson proposed the plum pudding model of the atom. Atoms are mostly positive with negative particles.
slide16
1909 – Rutherford conducted his famous gold foil experiment discovering that atoms were mostly empty space with a dense positive center.
slide17
1913 – Bohr describes the orbit of atoms as traveling around the nucleus in definite orbits (planetary model).
slide18
1914 – Moseley used the cathode rays to determine the number of positive charges in the nucleus (first concept of atomic number).
slide20

TEGS: The Atom

Quantum Atom

engage

1

2

3

4

Engage

Cut a piece of paper in half as many times as you can.

Paper Cutting Link

explore
Explore

The “Black” box activity is important on several levels:

  • Students explore studying things they cannot see or directly touch.
  • Students share information with others to expand and check results.
  • Students learn that scientists cannot check for the right answer (Keep the box closed and never reveal what is inside!)
explore25
Explore

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.

explain
Explain

The atom is composed of mostly empty space.

Atom Field video http://www.tcet.unt.edu/tegs/chapter3/Atomic%20field_Medium.mov

slide27
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.

STM Animation

http://www.tcet.unt.edu/tegs/chapter3/STM%20Animation.ppt

slide28
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.

elaborate
Elaborate
  • Particle Play
  • Stripping Electrons
  • On the Shoulders of Giants
evaluate
Evaluate

Allow students to choose a particle and write an illustrated “biography.” Include the particle’s discovery, charge, and location in the atom.