Basic Concepts of Matter

What is the basic unit of matter?

• Molecule

• Atom

• Ion

• Compound

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Where are protons located in an atom?

• Orbitals

• Nucleus

• Electron cloud

• Shells

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What charge do electrons have?

• Positive

• Neutral

• Negative

• No charge

Why are atoms neutral?

• Because they have more protons than electrons

• Because they have more electrons than protons

• Because the number of electrons equals the number of protons

• Because they have no charge

What is the center of the atom called?

• Nucleus

• Electron cloud

• Proton

• Neutron

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NGSS.MS-PS1-1

Which two subparticles are in the middle (represented by the red and blue spheres)?

• Electrons and protons

• Neutrons and electrons

• Protons and neutrons

• Electrons and positrons

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What are the tiny yellow subparticles around the perimeter?

• Neutrons

• Electrons

• Protons

• Quarks

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What are the circles around the perimeter called?

• Orbits

• Shells

• Rings

• Paths

Is the carbon atom shown in the diagram neutral or charged?

• Neutral, because it has an equal number of protons and electrons.

• Charged, because it has more electrons than protons.

• Charged, because it has more protons than electrons.

• Neutral, because it has more neutrons than protons.

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NGSS.MS-PS1-1

What is an element?

• A substance consisting of one type of atom

• A mixture of different compounds

• A combination of molecules

• A type of chemical reaction

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