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

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Earn 100

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.

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>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.