Models of the Atom

According to Democritus, atoms

• represent air, earth, fire, and water.

• may be cut into pieces to make different types of matter.

• are nonexistent.

• are indivisible.

What is the smallest particle of an element

that retains its identity in a chemical

reaction?

• Atom

• Electron

• Molecule

• Compound

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According to Dalton’s Atomic Theory, what

composes all elements?

• Atoms

• Electrons

• Molecules

• Compounds

Are atoms of one element the same as

atoms of another element?

• Yes

• No

• Sometimes, it depends upon the chemical reaction.

• Yes, but only after radioactive decay.

Can atoms of different elements

physically mix together?

• Yes

• No

• Sometimes, it depends upon the chemical reaction.

• Yes, but only after radioactive decay.

Can you ever get half an atom?

• Yes

• No

• Sometimes, it depends upon the chemical reaction.

• Yes, but only after radioactive decay.

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Which of the following is NOT an

example of a subatomic particle?

• Electron

• Molecule

• Neutron

• Proton

Protons are

• evenly charged

• negatively charged

• neutrally charged

• positively charged

Electrons are

• evenly charged

• negatively charged

• neutrally charged

• positively charged

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Neutrons are

• evenly charged

• negatively charged

• neutrally charged

• positively charged