Atoms, Atomic Structure, and Electrostatics

What is true about an atom?

• Most of the space in an atom is taken up by the nucleus

• Atoms are mostly empty space

• Atoms have no mass

• Electrons have much more mass that protons or neutrons.

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The atomic nuclei of almost all elements consists of

• protons

• protons and electrons

• protons and neutrons

• only neutrons

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The law of conservation of charge states that...

• all atoms have more protons than electrons
• only protons can be rubbed off of an atom
• charge cannot be created or destroyed
• charge cannot be transferred 

What part of the atom is show by the red sphere?

• nucleus

• electron cloud

• electrons

• neutrons

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Which of these phrases best describes an atom?

• a positive nucleus surrounded by a hard negative shell

• a positive nucleus surrounded by a cloud of negative charges

• a hard sphere with postive and negative charges on the outside

• a negative nucleus surrounded by protons and neutrons

Two like charges

•  neutralize each other.
• repel each other. 
• must be neutrons. 
• attract each other.

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Walking across a carpet is an example of charge being transferred by

• friction.
• induction.
• contact.
• static electricity

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In a good conductor, electrons are usually

• free to move around

• free to move around after an impurity has been added

• semi-free to move around

• tightly bound in place

In a good insulator, electrons are usually

• free to move around

• free to move around after an impurity has been added

• semi-free to move around

• tightly bound in place

What method of static charging is shown in this picture

• Contact

• Friction

• Grounding

• Electron Shifting

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