Atomic Theory

Smallest possible particle of an element

A comparison or relationship between two values.

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NGSS.MS-PS3-1

any substance that has a specific element or combination of atoms.

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NGSS.MS-PS1-1

A pure substance that has a specific element or combination of atoms.

Which are made of matter? Check all that apply.

• air

• Sound Waves

• bicycles

• Sunlight

• trees

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NGSS.5-PS1-1

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Matter is any substance that has _______ and takes up ________.

• mass and space

• money and time

• protons and positive charges

• chemical reactions and elements

First person to propose the concept of an atom

• Rutherford

• Democritus

• Dalton

• Bohr

Which of the following shows the correct order of Atomic Theory Timeline

• Rutherford, Bohr, Dalton, Democritus, Thomson

• Bohr, Democritus, Thomson, Rutherford, Dalton

• Dalton, Thomson, Rutherford, Bohr, Democritus

• Democritus, Dalton, Thomson, Rutherford, Bohr

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NGSS.MS-PS1-1

Thomson Experimented with ______

• Gold Foil

• alpha particles

• cathode rays

• protons

Rutherford experimented with ____

• Gold foil and alpha particles

• Cathode rays and alpha particles

• electron and alpha particles

• gold foil and cathode rays