Introduction to Chemistry

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

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The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

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the central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

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an atom with atomic number 6 would have how many protons 

• 6
• 12
• 3
• cannot be determined 

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Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

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Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is –

• a gas at room temperature.
• made of two different elements.
• given off by green plants.
• useful to human beings.

How many protons does this atom have?

• 2.5
• 6
• 5
• 10.811

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What part of the atom is the arrow pointing to?

• nucleus
• proton
• electron shell
• electron

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If the number of protons equal the number of _____, the atom will have no charge

• protons
• neutrons
• electrons
• nucleus

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Which of the following represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

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