Atoms, Elements, Molecules and Compounds

A substance made up of atoms of two or more different elements that are chemically combined

• atoms
• elements
• molecule
• compound

Which label of the diagram represents the protons?

• A

• B

• C

• A and B

Which label of the diagram represents the electrons?

• A

• B

• C

• A and B

How many neutrons does this element have?

• 200.59
• 80
• 120.59
• 201

Which of the following is a compound?

• O₂
• K
• CH₄
• Na

Which of the following is an atom?

• O

• H₂0

• CO

• C₃H₈

Which of the following is a molecule?

• O

• CO₂

• Li

• Pb

Which of the following is an Element?

• Fe2O₃

• 0₂

• H₂0

• Pb

Study the diagram. How many total atoms are there?

Study the diagram. How many molecules are there?