Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help...

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Activity #38 Atomic Theory : How do we know what atoms are made of? • In science, we use models to help us understand particles, like atoms, that are too small to see. • The following slides show how scientists were able to discover the parts and function of the atom.

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Transcript of Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help...

Page 1: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Activity #38 Atomic Theory:

How do we know what atoms are made of?

• In science, we use models to help us understand particles, like atoms, that are too small to see.

• The following slides show how scientists were able to discover the parts and function of the atom.

Page 2: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 1:Democritus (400 BC)

• Ancient Greek philosopher• Believed that everything in

the universe was made of indivisible particles called “atoms” (or “atomos” in Greek)

• Said atoms were constantly moving

• Atoms only differed in shape, position, and arrangement

Page 3: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Democritus Cont’d

Page 4: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 2: John Dalton (1803)

• Visualized atoms to look like a pool ball/bowling ball

All elements are made of atoms.All atoms of the same element are exactly

alike and have same mass.An atom of one element cannot be changed

into an atom of a different element.Atoms cannot be created nor destroyed, only

rearranged.Compounds are made from atoms of

different elements.

Page 5: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

John Dalton Cont’d

Page 6: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 3: J.J. Thomson (1897)• Visualized the atom to

look like a chocolate chip muffin or plum pudding

• An atom consists of negative charges scattered throughout a ball of positive charges.

• Proved that an atom could be divided

• Said the atom is neutral.

Page 7: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

JJ Thomson Cont’d

Page 8: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 4: Ernest Rutherford (1908)

Rutherford was a student of Thomson.

Visualized the atom to look like a peach

Positive charge (protons) is located in the center of the atom.

Center is called the nucleus.Almost all of the atom’s mass is

located in the nucleus.Atom is mostly empty space with

the electrons moving around the nucleus.

Page 9: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Ernest Rutherford Cont’d

Page 10: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 5: Niels Bohr (1913)• Student of Thomson and

Rutherford• Visualized the atom to look

like a sliced red onion & planets in the solar system

• Electrons orbit around the nucleus in a definite orbit

• Electrons could have only specific amounts of energy, leading them to move in certain orbits

Page 11: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Niels Bohr Cont’d

Page 12: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 6: The Electron Cloud Model (1920s)

• Electrons do not move in a definite path

• It is impossible to determine the exact location of an electron

• The atom has a small, positively charged nucleus, surrounded by the electron cloud

Page 13: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

The Electron Cloud Model Cont’d

Page 14: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 7: Atomic Model Brainpop

• Go to www.brainpop.com

• Username: kyrene

• Password: myksd

• Watch the brainpop on the Atomic Model, then take the quiz, and email it to Mrs. Mulhern [email protected]

http://www.brainpop.com/
mailto:[email protected]
Page 15: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 8: Periodic Table Brainpop

• Go to www.brainpop.com

• Username: kyrene

• Password: myksd

• Watch the brainpop on the Periodic Table, then take the quiz, and email it to Mrs. Mulhern [email protected]

http://www.brainpop.com/
mailto:[email protected]
Page 16: Activity #38 Atomic Theory: How do we know what atoms are made of? In science, we use models to help us understand particles, like atoms, that are too.

Station 9: Organize your Notebook!

Quarter 2

28. Matter Flow Chart

29. Mixtures Notes

30. Mixtures Web Activity

31. Properties of Solutions

32. Solubility Lab

33. Physical and Chemical Changes

34. Signs of a Chemical Reaction

35. Upset Stomach Lab

36. Periodic Table 

37. Atoms and the Periodic Table

38. Atomic Theory


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