Chemistry| 2° trimester| Atoms and The Periodic Table

This Scientist thought that the atoms were tiny, hard and uncuttable. He thought that depending of the atom shape the elemnt will behave.

• Democritus

  (~ 400- 300 B. C)

• J. J. Thompson

  (1897)

• Niels Bohr

  (1913)

• John Dalton

  (1803)

The Scientist believed that the atom was a sphere of positive charge containing a few negatively charge particles called electrons, distributed in the sphere like raising in a plum pudding.

• J. J. Thompsons

  (1897)

• Niels Bohr

  (1913)

• John Dalton

  (1803)

• Rutherford

  (1909)

This scientist believed that the atom was a solid, indivisible sphere. And it couldn't be destroyed or reconstructed.

• Niels Bohr

  (1913)

• J. J Thompson

  (1897)

• John Dalton

  (1803)

• Rutherford

  (1909)

Scientist that believed that the electrons in atoms are restricted to certain circular orbit about the nucleus. Similar to the planet orbit around the sun.

• Schrödinger

  (1926~ present)

• John Dalton

  (1803)

• Niels Bohr

  (1913)

• Rutherford

  (1909)

Scientist that believed that atoms were divisible units composed of positive charges concentrated in the nucleus with negative charges orbiting around the nucleus.

• Niels Bohr

  (1913)

• John Dalton

  (1803)

• J. J. Thompsons

  (1897)

• Rutherford

  (1909)

Scientist that thought atoms is a probability to find electrons within a space sorrounding the nucleus. The cloud is denser when the probability of finding an electron is high. the cloud is less dense when the probability of finding the electron is low.

• Democritus

  (~ 400- 300 B. C)

• Schrödinger

  (1926~ present)

• John Dalton

  (1897)

• Rutherford

  (1909)

What are some characteristics of the atom according to John Dalton theory?

• Matter is composed of atoms.

• Chemial elements are formed of different types of atoms.

• Depending on its chemical properties, atoms chemically combine with each other and form groups.

• All of the above.

Which subatomic particles represent the red spheres?

• Electron cloud

• Neutrons

• Protons

• Electrons

Which subatomic particles represent the green spheres?

• Electron cloud

• Neutrons

• Protons

• Electrons

Where the electrons are ubicated?

• Electron cloud

• Neutrons

• Protons

• Electrons