Atoms Protons Electrons Elements

All matter is made of 

• energy 

• atoms 

• electrons 

• compounds 

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What is the basic unit of matter and is the smallest particle of an element?

• Atoms

• Elements

• Compounds

• Molecules

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This subatomic particle of an atom has a POSITIVE charge.

• electron

• neutron

• proton

• amitron

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Protons and neutrons clump together to form the __________ of an atom.

• nucleus

• centrosome

• outer shell

• orbital

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This subatomic particle of an atom has a NEGATIVE charge.

• electron

• proton

• atom

• neutron

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The image shows the periodic grid of potassium. How many electrons are found in the potassium atom?

• 19

• 20

• 39

• 40

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Which part of an atom is represented by the blue circles?

• electrons

• neutrons

• protons

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Which part of an atom is represented by the orange circles?

• electrons

• neutrons

• protons

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Elements are made of 

• many types of atoms 

• the periodic table

• one type of atom 

• molecules 

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How many hydrogen atoms are there in a water molecule? 

• 0

• 1

• 2

• 3

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