Development of the Model of the Atom

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  • Created by: swagskool
  • Created on: 02-08-22 11:23
When Democritus first conceived of atomic theory, around 500 BC, how did he describe atoms?
-Small spheres
-The smallest possible unit of matter
-Separated from each by empty space
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n the 1800's John Dalton described atoms as solid ___, and suggested that different types of spheres make up the different ___.

rocks / cubes / spheres / atoms / elements
In the 1800's John Dalton described atoms as solid spheres, and suggested that different types of spheres make up the different elements.
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In 1897 J J Thomson theorised that an atom consists of a ball of positive charge, with negative electrons mixed throughout it. What do we call this model?
Plum pudding model
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In the 20th century, Chadwick discovered neutral particles in the atomic nucleus. What are these particles called?
Neutrons
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Dalton's Model
States that atoms are like a smooth, solid sphere that cannot be broken down into smaller pieces.
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Thomson's Model
States that atoms are negatively-charged particles are imbedded in positively-charged sphere, like chocolate chips in a cookie.
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Rutherford's Model
Atoms are mostly empty space filled with electrons. He proved atoms have a positively-charged nucleus when a stream of positive particles shot through gold foil were deflected; two positive particles repel one another. He named these positive particles in
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Bohr's Model
His model resembled a cut onion, like rings. He believed electrons orbited around the nucleus like planets around the sun.
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Modern Model
This model, developed in the 1930s and still used today, describes the atom with protons and neutrons making up an atom's nucleus and electrons in a cloud surrounding it.
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Card 2

Front

n the 1800's John Dalton described atoms as solid ___, and suggested that different types of spheres make up the different ___.

rocks / cubes / spheres / atoms / elements

Back

In the 1800's John Dalton described atoms as solid spheres, and suggested that different types of spheres make up the different elements.

Card 3

Front

In 1897 J J Thomson theorised that an atom consists of a ball of positive charge, with negative electrons mixed throughout it. What do we call this model?

Back

Preview of the front of card 3

Card 4

Front

In the 20th century, Chadwick discovered neutral particles in the atomic nucleus. What are these particles called?

Back

Preview of the front of card 4

Card 5

Front

Dalton's Model

Back

Preview of the front of card 5
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