Complete the table below to estimate the boiling point and atomic radius of caesium. Comment also on the reactivity of potassium and caesium with water. Group I metal Density / g / Cm 3 Radius of metal atom nm Boiling point ° C Reactivity with water Sodium 0 . 97 0 . 191 883 Floats and fizzes quickly on the surface, disappears gradually and does not burst into flame. Potassium 0 . 86 0 . 235 760 _____ Rubidium 1 . 53 0 . 250 686 Reacts instantaneously, fizzes and burst into flame then spits violently and may explode. Caesium 1 . 88 _____ _____ _____

Reactivity of potassium with water: Potassium is the third alkali metal and its reaction with water is more vigorous than sodium. It floats on the surface of the water and fizzes vigorously. It disappears and catches fire with a lilac flame. Reactivity of caesium with water: Caesium is the fourth alkali metal which is more reactive than the metals above it in the periodic table. It reacts vigorously with water and explodes. It can also shatter the container. The radius of the atom is the distance between the outermost shell and the centre of the nucleus. As moving down the group we can see that the atomic radius is increasing and the boiling point is decreasing. Thus, the atomic radium of caesium atom is 0 . 265 nm , and its boiling point is 671 ° C . The complete table is as follows: Group I metal Density / g / Cm 3 Radius of metal atom nm Boiling point ° C Reactivity with water Sodium 0 . 97 0 . 191 883 Floats and fizzes quickly on the surface, disappears gradually and does not burst into flame. Potassium 0 . 86 0 . 235 760 It floats on the surface of the water and fizzes vigorously. It disappears and catches fire with a lilac flame. Rubidium 1 . 53 0 . 250 686 Reacts instantaneously, fizzes and burst into flame then spits violently and may explode. Caesium 1 . 88 0 . 265 671 It reacts vigorously with water and explodes. It can also shatter the container.

E M B I B E

Cambridge IGCSE Chemistry Workbook 4th Edition>Chapter 8 - Patterns and Properties of Metals>Exercise 8.1

Richard Harwood and Ian Lodge Solutions for Chapter: Patterns and Properties of Metals, Exercise 1: Exercise 8.1

Author:Richard Harwood & Ian Lodge

Richard Harwood Chemistry Solutions for Exercise - Richard Harwood and Ian Lodge Solutions for Chapter: Patterns and Properties of Metals, Exercise 1: Exercise 8.1

Attempt the practice questions on Chapter 8: Patterns and Properties of Metals, Exercise 1: Exercise 8.1 with hints and solutions to strengthen your understanding. Cambridge IGCSE Chemistry Workbook 4th Edition solutions are prepared by Experienced Embibe Experts.

Questions from Richard Harwood and Ian Lodge Solutions for Chapter: Patterns and Properties of Metals, Exercise 1: Exercise 8.1 with Hints & Solutions

MEDIUM

Upper Secondary-IGCSE

IMPORTANT

Cambridge IGCSE Chemistry Workbook 4th Edition>Chapter 8 - Patterns and Properties of Metals>Exercise 8.1>Q a

Caesium is an alkali metal. It is in Group I of the Periodic table.

State two physical properties of caesium.

EASY

Upper Secondary-IGCSE

IMPORTANT

Cambridge IGCSE Chemistry Workbook 4th Edition>Chapter 8 - Patterns and Properties of Metals>Exercise 8.1>Q b

Caesium is an alkali metal. It is in Group I of the Periodic table.

State the number of electrons in the outer shell of a caesium atom.

HARD

Upper Secondary-IGCSE

IMPORTANT

Cambridge IGCSE Chemistry Workbook 4th Edition>Chapter 8 - Patterns and Properties of Metals>Exercise 8.1>Q c

Complete the table below to estimate the boiling point and atomic radius of caesium. Comment also on the reactivity of potassium and caesium with water.

Group I metal	Density $/ g / {Cm}^{3}$	Radius of metal atom $(nm)$	Boiling point $(° C)$	Reactivity with water
Sodium	$0.97$	$0.191$	$883$	Floats and fizzes quickly on the surface, disappears gradually and does not burst into flame.
Potassium	$0.86$	$0.235$	$760$	_____
Rubidium	$1.53$	$0.250$	$686$	Reacts instantaneously, fizzes and burst into flame then spits violently and may explode.
Caesium	$1.88$	_____	_____	_____