The table shows the boiling points of some of the Group 8 elements. Name Boiling point( ° C ) Helium - 272 Neon - 249 Argon - 189 Krypton Xenon - 112 Radon - 71 a) Describe the trend in data. b) Estimate the boiling point of Krpton.

a) The boiling points of the noble gases are very low compared to those of other substances with similar masses. Boiling point increases on moving down the group from helium to radon. This indicates that strong forces are present between the atoms of the noble gases in the liquid or the solid state. b) Noble gases can be liquefied at very low temperature, hence, they have low boiling point. Boiling point of Krypton is - 153 ° C .

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Earn 100

An aluminium atom has the atomic number 13 and a mass number of 27.

Draw a diagram of the atom, showing the electrons in their shells.

Important Questions on The Periodic Table

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>Exercise 7>Q 5

Give the name and symbol of an element that is an unreactive gas that glows when electricity is passed through it.

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>Exercise 8>Q 7

When elements react with other elements their atoms form a full outer shell of electrons. Use this information to suggest why the noble gases are unreactive.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 4

What word completes this sentence?
Elements in the same _____ in the Periodic Table share similar properties.

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 11

An aluminium atom has the atomic number 13 and a mass number of 27.

State what period and group aluminium is in the Periodic Table. Explain how you can use its electron structure to work this out.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 12

Use what you know about how electrons are arranged in atoms to explain why elements in the same group share similar properties.

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 14

The gold foil experiment performed by Rutherford and his team was repeated many times by them and by other scientists. Suggest why this is important.

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 15

The table shows the boiling points of some of the Group 8 elements.

Name	Boiling point( $° C$ )
Helium	$- 272$
Neon	$- 249$
Argon	$- 189$
Krypton
Xenon	$- 112$
Radon	$- 71$

a) Describe the trend in data.

b) Estimate the boiling point of Krpton.

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 16

Rajeev read on a website that 'Mendeleev invented the periodic table we use today'. Discuss the arguments for and against this statement.

An aluminium atom has the atomic number 13 and a mass number of 27. Draw a diagram of the atom, showing the electrons in their shells.

Important Questions on The Periodic Table

Learn and Prepare for any exam you want !

An aluminium atom has the atomic number 13 and a mass number of 27.

Draw a diagram of the atom, showing the electrons in their shells.