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KS3 Chemistry:

Elements

and the periodic table

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Elements

What is the element symbol for...

1. Hydrogen.

2. Magnesium

3. Iron.

4. The list on the right shows 6 substances. Which one is not an element?

5. Na and Au are both elements. Which of these answers gives the correct elements for these symbols?

Na Au
A
Nitrogen Gold
B
Sodium Gold
C
Nitrogen Silver
D
Sodium Silver

 

 

 

6. Which of these is the best description for a compound?

  • A. A substance made of one element only.
  • B. A substance made of two or more elements mixed together.
  • C. A substance made of one element, but with atoms joined together.
  • D. A substance made of two or more elements joined together.

7. Which of these is the best description for a molecule?

  • A. A single atom.
  • B. Two or more atoms joined together.
  • C. Two or more elements mixed together.
  • D. Part of an atom.

 

8-10. Here is a picture of chlorine gas. Two chlorine atoms are joined together.

chlorine gas molecule

 

 

8. The diagram above shows..

  • A. an atom of an element.
  • B. an atom of a compound.
  • C. a molecule of an element.
  • D. a molecule of a compound.

9. How is this written down in symbols?

  • A. Cl2
  • B. Cl2
  • C. 2Cl
  • D. Cl2

10. Chlorine is element number 17. What is element number 1?

  • A. Hydrogen.
  • B. Helium.
  • C. Oxygen.
  • D. Carbon