Review of Early Ideas of Atomic Theory

Democritus's word "atomos" means what?

• means at most

• made up of quarks

• is indivisible, or cannot further be broken down

• can be further built up

Answer explanation

We know today that atoms are not the smallest particles, but they can be further broken down!

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NGSS.MS-PS1-1

Matter is defined as anything that takes up space and has mass...

matter is made up of what?

• water

• energy

• space

• atoms

Answer explanation

Defintely not water, though water is important to life here on Earth.

Energy we will learn more about later!

Space and Tme are difficult to truly understand, if you pursue science you will learn more about these topics!

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Why did early philosophers think that things were made up of Earth, Wind, Fire, and Water?

• They thought they were made up of things they could see around them.

• They thought these concepts were how the universe was created.

• They thought they were made up of atoms.

• They saw these things in the stars.

Answer explanation

The scientific method was developed until 1000s of years later! Philosphers "think" but don't experiment.

A substance that is made up of only one kind of atom is considered...

• an element

• a compound

• an atom

• multiple atoms

Answer explanation

This is our definition for element.

Both Aristotle and Democritus were philosphers not scientists... what did this mean about their ideas?

• they had support from their peers

• they had no experimental evidence to support their ideas

• they thought a lot of stuff, and tested them out

• they created ideas about the universe

Why did it take 2000 years before Dalton was able to support the idea of the atom with experimental evidence?

• war and poverty prevented things

• technology and science was not advance enough until then

• no one was smart enough to figure it out

• no one was interested in atoms

Can you create or destroy atoms?

• Yes!

• No!

• Maybe.

• zZz (-_-)

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What did Thomson contribute to the atomic theory with his "Plum Pudding Model"?

• the word "atomos"

• discovered the electron (and that there was a + charge)

• discovered the neutron! (that the atom was neutral)

• discovered the nucleus!

What did Rutherford contribute to the atomic theory with his "nuclear model"?

• the word "atomos"

• discovered the electron (and that there was a + charge)

• discovered the neutron! (that the atom was neutral)

• discovered the nucleus! (a dense center)

What did Bohr contribute to the atomic theory with his "planetary model"?

• discovered that electrons were in fix orbits around the nucleus

• discovered the electron (and that there was a + charge)

• discovered the neutron! (that the atom was neutral)

• discovered the nucleus! (a dense center)