Chapter 9 Lesson 2 How Atoms Differ

What is the atomic number of this element?

• 79

• 196

• there is not enough information

• 196.97

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Marie Curie discovered what?

• radioactive elements

• science

• the modern atomic model

• electrons

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Where are the electrons located?

• a

• b

• c

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Where are the protons located?

• a

• b

• c

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Where are the neutrons located?

• a

• b

• c

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What is the most dense part of the atom? (Hint: It is what the particles hit in the Gold Foil experiment)

• electron cloud

• nucleus

• electron levels

• it all has the same density

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True or False: The Atom is made mostly of empty space.

• True

• False

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Elements that spontaneously emit radiation are said to be...

• on fire

• radioactive

• toxic

• bioluminescent

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Made up of 2 protons and 2 neutrons, this is emitted by some radioactive substances...

• alpha particles

• beta particles

• gamma rays

• ions

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A ________ occurs when a neutron in an atom changes into a(n) proton and a high-energy electron.

• alpha particle

• beta particle

• gamma ray

• super electron

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