Two statements about argon are given.

1 Argon has a full outer shell of electrons.

2 Argon is very reactive and is used in lamps.

Which is correct?

• Both statements are correct and statement 2 explains statement 1.

• Both statements are correct but statement 2 does not explain statement 1.

• Statement 1 is correct but statement 2 is incorrect.

• Statement 2 is correct but statement 1 is incorrect.

Part of the Periodic Table is shown.

Which element is a gas that does not form a compound with potassium?

• A

• B

• C

• D

Two statements about noble gases are given.

1  Noble gases are reactive, monatomic gases.

2  Noble gases all have full outer shells of electrons.

Which is correct?

• Both statements are correct and statement 2 explains statement 1.

• Both statements are correct but statement 2 does not explain statement 1.

• Statement 1 is correct but statement 2 is incorrect.

• Statement 2 is correct but statement 1 is incorrect.

The Group 0 elements are unreactive.

The gas used to fill balloons is .......X....... .

This gas is unreactive because it has ......Y....... electrons in its outermost shell.

Which words correctly complete gaps X and Y?

• X - argon

  Y - eight

• X - argon

  Y - two

• X - helium

  Y - eight

• X - helium

  Y - two

Hydrogen and helium have both been used to fill balloons.

Which property of helium makes it the preferred choice to hydrogen?

• easily compressed into a gas cylinder

• forms monatomic molecules

• lower density

• unreactive

The following statements are about elements in the Periodic Table.

1  Their atoms have a full outer shell of electrons.

2  They form basic oxides.

3  They are found in Group 0.

4  They are present in small quantities in the air.

Which statements are correct for the noble gases?

• 1, 2 and 3

• 1, 2 and 4

• 1, 3 and 4

• 2, 3 and 4

The noble gases, which are in Group 0 of the Periodic Table, are all very ....... 1....... . ....... 2......., one of these gases, is used to provide an inert atmosphere in lamps. Another, ....... 3......., is used for filling balloons because it is less dense than air.

Which words complete the sentences about noble gases?

• 1- reactive

  2- argon

  3- helium

• 1- reactive

  2- helium

  3- argon

• 1- unreactive

  2- argon

  3- helium

• 1- unreactive

  2- helium

  3- argon

The diagram shows a section of the Periodic Table.

Which element is described below? ‘A colourless, unreactive gas that is denser than air.’

• A

• B

• C

• D

An inert gas X is used to fill weather balloons.

Which descriptions of X are correct?

• A

• B

• C

• D

Why is argon gas used to fill electric lamps?

• It conducts electricity.

• It glows when heated.

• It is less dense than air.

• It is not reactive.