This is the smallest unit of an element.

• atom

• molecule

• compound

• nucleus

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NGSS.MS-PS1-1

Any combination of two or more atoms that are chemically combined is called this.

• molecule

• compound

• element

• pure substance

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NGSS.MS-PS1-1

The most pure substances that can be found, made of only one type of atom

• elements

• atoms

• molecules

• compounds

What is a compound?

• an atom with more electrons than protons
• a substance in which the atoms of two or more elements are combined together
• an atom with more neutrons than protons
• a substance in which the atoms of three or more elements are combined together

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NGSS.MS-PS1-1

Atoms combine to form _______. 

• electrons
• molecules
• nuclei
• neutrons

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NGSS.MS-PS1-1

Which of the diagrams pictures shows an ELEMENT?

• I

• II

• III

• IV

• None of the above

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NGSS.MS-PS1-1

Look at the image. It can be described as

• an element and a molecule

• an element and an atom

• a compound and a molecule

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NGSS.MS-PS1-1

Look at the image. It can be described as

• an element made of molecules

• an element made of atoms

• a compound and a molecule

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NGSS.MS-PS1-1

Take a look at the image. Which of the following molecules are ALSO classified as compounds? Select ALL that apply!

• nitrogen oxide

• water

• nitrogen dioxide

• chlorine

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NGSS.MS-PS1-1

A pure substance made up of one type of atom only

• atom

• element

• molecule

• compound