NGSS.MS-PS1-1

Smallest unit of an element

• compound
• atom
• molecule
• product

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Describe an Electron Cloud?

• the mist outside of an atom
• home of the protons
• where electrons are located
• nucleus

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NGSS.MS-PS1-1

Which one has more than one type of atom in it

• Element
• Compound 

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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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If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?

• 12 neutrons
• 12 electrons
• 12 protons
• 24 protons and neutrons

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NGSS.MS-PS1-1

NaHCO₃ is an example of —

• an abbreviation
• a compound
• a mixture
• an element

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NGSS.MS-PS1-1

S8P1a Ammonia can be represented by the chemical formula NH₃. Which of the following best describes ammonia?

• an atom

• a compound

• an element

• a mixture

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NGSS.MS-PS1-1

If an atom has 10 electrons, how many protons does it have?

• 0

• 1

• 10

• 5

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NGSS.MS-PS1-1

A molecule is a group of atoms that are held together by chemical bonds.

• True

• False

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NGSS.MS-PS1-1

What is the atomic number?

• 35

• 18

• 17

• 52

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NGSS.MS-PS1-1