History of the Atomic Model

Multiple Choice

Which of the following atomic models best represents the model that John Dalton suggested?

Drag and Drop

John Dalton proposed the​

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in​

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. His theory provided the understanding of the structure of the atom which later became known as the Billiard Ball model. This model indicated that the atom was​

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in size, was​

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, and

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in shape. This model of the atom lasted for nearly one hundred years before scientists discovered evidence that disproved the model.

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Atomic Theory

1803

extremely small

indivisible

spherical

Nuclear Theory

made of a nucleus

1897

Drag and Drop

JJ Thomson discovered the​

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in

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. He did this by performing experiments on the​

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. While experimenting he determined that there were particles that had a mass ​2000 times

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than the smallest mass of element, hydrogen. Furthermore, he was able to determine that the particle had a​

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charge.

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electron

1897

cathode ray tube

negative

positive

1803

nucleus

smaller

larger

Drag and Drop

With the discovery of the electron, JJ Thomson proposed a new model for the atomic structure known as the

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model. He described the atom to be solid and

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charged with​ much smaller,

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charged particles embedded randomly throughout.

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Plum Pudding

positively

negatively

Nuclear

nuetral

Multiple Choice

Which of the following atomic models best represents the model that JJ Thomson proposed?

Multiple Choice

Which of John Dalton's postulates was disproved by the discovery of the electron?

• All matter is composed of extremely small particles called atoms.

• Atoms of an element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.

• Atoms cannot be subdivided, created, or destroyed.

• Atoms of different elements combine in simple whole-number ratios to form chemical compounds.

• In chemical reactions, atoms are combined, separated, or rearranged.

Drag and Drop

Ernest Rutherford discovered the​

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in​

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. He accomplished this by shooting​

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particles at thin sheets of metal. His expectation was that the particles would​

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the sheets of matter; however, he was surprised when one in​ 8000 particles​

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.

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nucleus

1911

alpha

pass through

bounced back

beta

gamma

proton

neutron

1932

Drag and Drop

The discovery of the nucleus led to a change in the way the atom was thought of. Ernest Rutherford proposed that the atom was mostly made of​

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and that the electrons​

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the nucleus.

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empty space

orbited around

negative solid mass

positive solid mass

embedded around

embedded within

Multiple Choice

Which of the following atomic models best represents the model that Ernest Rutherford proposed after discovering the nucleus?

Drag and Drop

Further experimentation led Ernest Rutherford to discover the​

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in​

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. He stated that they were​

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charged particles located within the​

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.

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proton

1919

positively

nucleus.

neutron

negatively

neutrally

orbitals

1932

electrons

Multiple Choice

Which of the following atomic models best represents the model that Ernest Rutherford proposed after discovering the proton?

Drag and Drop

James Chadwick discovered the​

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in​

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. This was the last fundamental subatomic particle that made up the atom. He stated that the particle was located in the​

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and had a​

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charge. It had a mass that was slightly larger than that of the

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.

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neutron

1932

nucleus

neutral

proton

electron

1913

atom

positive

negative

Multiple Choice

Which of the following atomic models best represents the model that James Chadwick proposed?

Categorize

Options (13)

$$e^-$$  

mass of 0.00055 amu

located in orbitals

-1 relative charge

$$n^0$$  

mass of 1.008 amu

neutrally charged

0 relative charge

$$p^+$$  

mass of 1.007 amu

+1 relative charge

provides charge of nucleus

provides additional (originally missing) mass to the nucleus

Organize the following into the correct category about the subatomic particles

Electron

Neutron

Proton

Reorder

Order the following models in chronological order, starting with the original model of the atomic structure.

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Match

Match the following atomic models with the dates in which they were proposed.

1803

1897

1911

1919

1932

• 1803

• 1897

• 1911

• 1919

• 1932