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Unit 4: The atom

  • Can we divide something as many times as we want?
  • If we could break a tree leaf into smaller and smaller pieces, what would happen?
  • Would we go from having matter to having nothing?

First ideas on the atom

Democritus: in the fifth century BC. The Greek word ατoμoν (atom) means indivisible because they believed that atoms could not be broken into smaller pieces.

Evolution of atomic theory

According to the atomic theory, matter is composed of indivisible particles: ATOMS.

Timeline

1789 Antoine Lavoisier
1803-1808Dalton
1897 Thomson
1911 Rutherford

ATom video

Evolution of atomic theory: LAVOISIER

Evolution of atomic theory: Lavoisier

In 1789, Antoine Lavoisier published the law of conservation of mass:

  • In a chemical reaction, mass is neither created nor destroyed.

Evolution of atomic theory: DALTON

Evolution of atomic theory: Dalton

Dalton interpreted the law of conservation of mass by applying the atomic theory he developed. Dalton's atomic theory: mass is conserved because, in a chemical reaction, the atoms that make up matter rearrange themselves but are neither created nor destroyed.

Evolution of atomic theory: Dalton

  • Matter is composed of atoms, which are indivisible particles.
  • There are different types of atoms corresponding to different chemical elements (carbon, iron, aluminum, etc.).

Evolution of atomic theory: Dalton

  • Atoms of the same chemical element are the same.
  • They can combine to form simple substances, or atoms of different chemical elements can combine to form compounds.

Evolution of atomic theory: THOMSON

Evolution of atomic theory: Thomson

In 1897, Thomson discovered that there is a particle with a negative electric charge that can be exchanged between atoms: the electron.

Evolution of atomic theory: Thomson

  • Gaining electrons: Negative electric charge
  • Losing electrons: Positive electric charge.

Evolution of atomic theory: RUTHERFORD

Evolution of atomic theory: Rutherford

In 1911, Rutherford discovered that there are two distinct regions in the atom:

  • Nucleus
  • Electron cloud.

to minute 6:02

ATom video

ATOMIC NUMBER, MASS NUMBER AND ISOTOPES

ATOMIC NUMBER AND MASS

ATOMIC NUMBER

Number of protons in an element (Z)All atoms of the same chemical element have the same atomic number.Atoms with an atomic number greater than 92 are produced artificially.

A = Z + N

MASS NUMBER

The mass number (A) is the sum of the number of protons(Z) and the number of neutrons (N) in an atom.

ISOTOPES

Not all atoms of the same chemical element have the same atomic mass.There are atoms that have:

  • Same number of protons atomic number (Z)
  • Different number of neutrons..

Bibliography :(good sources of information)

ATOMIC MODEL SCIENCE PROJECT

Groups of 3

No copy + paste

All members must know all the information

No reading of presentation. Slides are there just to help you

Wow factor!

ATOMIC MODEL SCIENCE PROJECT

Choose a model

Bohr, Rutherford, Thomson, Schrodinger, Dalton, etc.

Describe main characteristics
  • History leading to the model and after the model
  • Main characteristics
  • How would you improve it?
  • Find news/fun facts on recent theories or on atomic theory
  • More!
Presentation

Show us your model and make everyone know the information.Prepare at least 2 questions for every other group

Project %

40%

Work + Slides

40%

Presentation

20%

Originality

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With Genially templates, you can include visual resources to leave your audience amazed. You can also highlight specific phrases or data that will be etched in your audience's memory, and even embed external content that surprises: videos, photos, audios... Whatever you want!

Inserta un vídeo genial paratu presentación

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Aquí puedes incluir un datorelevante a destacar

Here you can put a highlighted title

With Genially templates, you can include visual resources that will leave your audience speechless. You can also highlight specific phrases or facts that will be etched in the memory of your audience, and even embed external content that surprises: videos, photos, audios... Whatever you want!

Here you can put a highlighted title

You can includean important piece of information

With Genially templates, you can include visual resources to leave your audience amazed. You can also highlight specific phrases or data that will be etched in your audience's memory, and even embed external content that surprises: videos, photos, audios... Whatever you want!

Here you can put a highlighted title

You can includean important piece of information

With Genially templates, you can include visual resources to leave your audience amazed. You can also highlight specific phrases or data that will be etched in your audience's memory, and even embed external content that surprises: videos, photos, audios... Whatever you want!

Here you can put a highlighted title

With Genially templates you will be able to include visual resources to leave your audience speechless. You can also highlight a specific phrase or data that will be etched in the memory of your audience, and even embed external content that surprises: videos, photos, audios... Whatever you want!

Here you can put a highlighted title

You can includean important piece of information

With Genially templates, you can include visual resources to leave your audience amazed. You can also highlight specific phrases or data that will be etched in your audience's memory, and even embed external content that surprises: videos, photos, audios... Whatever you want!

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Here you can put a highlighted title

You can includean important piece of information

With Genially templates, you can include visual resources to leave your audience amazed. You can also highlight specific phrases or data that will be etched in your audience's memory, and even embed external content that surprises: videos, photos, audios... Whatever you want!

Here you can put a highlighted title

You can includean important piece of information

With Genially templates, you can include visual resources to leave your audience amazed. You can also highlight specific phrases or data that will be etched in your audience's memory, and even embed external content that surprises: videos, photos, audios... Whatever you want!

With this function...

With this function...You can add additional content that excites the brains of your audience: videos, images, links, interactivity... Whatever you want!

With this function...

With this function...You can add additional content that excites your audience's brain: videos, images, links, interactivity... Whatever you want!

Here you can put a highlighted title

You can includean important piece of information

With Genially templates, you can include visual resources to leave your audience amazed. You can also highlight specific phrases or data that will be etched in your audience's memory, and even embed external content that surprises: videos, photos, audios... Whatever you want!

Here you can put a highlighted title

With Genially templates you can include visual resources to leave your audience speechless. You can also highlight specific phrases or data that will be engraved in the memory of your audience. You can even embed external content that surprises: videos, photos, audios... Whatever you want!

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Here you can place a highlighted title

With Genially templates, you can include visual resources to leave your audience speechless. You can also highlight a specific phrase or data that will be burned into the memory of your audience, and even embed external content that surprises: videos, photos, audios... Whatever you want!

With this function...

With this function...You can add additional content that excites your audience's brain: videos, images, links, interactivity... Whatever you want!

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With this function...You can add additional content that excites your audience's brain: videos, images, links, interactivity... Whatever you want!

Inserta un vídeo genial paratu presentación

Y usa este espacio para describirlo. El contenido multimedia es esencial en una presentación, para dejar a todo el mundo con la boca abierta. Además, así sintetizarás el contenido y entretendrás a tu audiencia.

Aquí puedes incluir un datorelevante a destacar