Download App
Google Android
Apple iOS
Huawei
English
English
Malay
Guest
Login
Register
Home
Quiz
Battle
Practice
Class
Classes List
Timetable
Assignments
Learn
Learning Hub
Quick Notes
Videos
Experiments
Textbooks
Login
Register
Download App
Google Android
Apple iOS
Huawei
EN
MS
Learn
Quick Notes
List
Elements in Group 17
Elements in Group 17
4.5
Elements in Group 17
Elements in Group 17
Also known as halogen.
Very reactive elements.
Can be found in the right column of the periodic table as below:
Uses of Group 17 Elements
Chlorine in bleach.
Bromine as a substance in fire extinguishers.
Iodine as a disinfectants
Physical Properties of Group 17 Elemets
Non-metals
Does not conduct heat and electricity.
Changes in Physical Properties of Elements When Going Down Group 17
The atomic radius increases.
Reactivity decreases.
Boiling and melting point increases.
The van der Waals force increases as the size of the atom increases.
The electronegativity decreases because the radius increases and the force between the valence electron and nucleus decreases.
Chemical Properties of Group 17 Elements
React with Water to Produce Acids
Element
Reaction with Water
Cl
\(Cl_2(g) + H_2O(l) \rightarrow HCl(aq) + HOCl(aq)\)
Br
\(Br_2(l) + H_2O(l) \rightarrow HBr(aq) + HOBr(aq)\)
I
\(I_2(s) + H_2O(l) \rightarrow HI(aq) + HOI(aq)\)
React with Metal to Produce Metal Halides
Element
Reaction with Iron
Cl
\(3Cl_2(g) +2Fe(s) \rightarrow 2FeCl_3(s)\)
Br
\(3Br_2(l) +2Fe(s) \rightarrow 2FeBr_3(s)\)
I
\(3I_2(s) +2Fe(s) \rightarrow 2FeI_3(s)\)
React with Sodium Hydroxide to Produce Salts and Water
Element
Reaction with Sodium Hydroxide
Cl
\(Cl_2(aq) +2NaOH(aq) \rightarrow NaCl(aq) + NaOCl(aq) + H_2O(l)\)
Br
\(Br_2(l) +2NaOH(aq) \rightarrow NaBr(aq) + NaOBr(aq) + H_2O(l)\)
I
\(I_2(s) +2NaOH(aq) \rightarrow NaI(aq) + NaOI(aq) + H_2O(l)\)
Reactivity of Group 17 Elements
Group 17 is very reactive, but the reactivity decreases down the group.
The elements will accept an electron to achieve a stable octet electron arrangement.
The forces between the nucleus and the valence electron become weaker as going down the group.
Element
\(\Downarrow\)
As Going Down the Group
F
The atomic radius increases.
\(\downarrow\)
The attractive forces between the nucleus and the valence electrons become weaker.
\(\downarrow\)
More difficult to receive or attract an electron to complete the valence shell.
\(\downarrow\)
Reactivity decreases.
Cl
Br
I
Elements in Group 17
4.5
Elements in Group 17
Elements in Group 17
Also known as halogen.
Very reactive elements.
Can be found in the right column of the periodic table as below:
Uses of Group 17 Elements
Chlorine in bleach.
Bromine as a substance in fire extinguishers.
Iodine as a disinfectants
Physical Properties of Group 17 Elemets
Non-metals
Does not conduct heat and electricity.
Changes in Physical Properties of Elements When Going Down Group 17
The atomic radius increases.
Reactivity decreases.
Boiling and melting point increases.
The van der Waals force increases as the size of the atom increases.
The electronegativity decreases because the radius increases and the force between the valence electron and nucleus decreases.
Chemical Properties of Group 17 Elements
React with Water to Produce Acids
Element
Reaction with Water
Cl
\(Cl_2(g) + H_2O(l) \rightarrow HCl(aq) + HOCl(aq)\)
Br
\(Br_2(l) + H_2O(l) \rightarrow HBr(aq) + HOBr(aq)\)
I
\(I_2(s) + H_2O(l) \rightarrow HI(aq) + HOI(aq)\)
React with Metal to Produce Metal Halides
Element
Reaction with Iron
Cl
\(3Cl_2(g) +2Fe(s) \rightarrow 2FeCl_3(s)\)
Br
\(3Br_2(l) +2Fe(s) \rightarrow 2FeBr_3(s)\)
I
\(3I_2(s) +2Fe(s) \rightarrow 2FeI_3(s)\)
React with Sodium Hydroxide to Produce Salts and Water
Element
Reaction with Sodium Hydroxide
Cl
\(Cl_2(aq) +2NaOH(aq) \rightarrow NaCl(aq) + NaOCl(aq) + H_2O(l)\)
Br
\(Br_2(l) +2NaOH(aq) \rightarrow NaBr(aq) + NaOBr(aq) + H_2O(l)\)
I
\(I_2(s) +2NaOH(aq) \rightarrow NaI(aq) + NaOI(aq) + H_2O(l)\)
Reactivity of Group 17 Elements
Group 17 is very reactive, but the reactivity decreases down the group.
The elements will accept an electron to achieve a stable octet electron arrangement.
The forces between the nucleus and the valence electron become weaker as going down the group.
Element
\(\Downarrow\)
As Going Down the Group
F
The atomic radius increases.
\(\downarrow\)
The attractive forces between the nucleus and the valence electrons become weaker.
\(\downarrow\)
More difficult to receive or attract an electron to complete the valence shell.
\(\downarrow\)
Reactivity decreases.
Cl
Br
I
Chapter : Periodic Table of Elements
Topic : Elements in Group 17
Form 4
Chemistry
View all notes for Chemistry Form 4
Related notes
Historical Development of the Periodic Table
The Arrangement of Elements in the Modern Periodic Table of Elements
Elements in Group 18
Elements in Group 1
Elements in Period 3
Transition Elements
Development in Chemistry Field
Scientific Investigation in Chemistry
Usage, Management and Handling of Apparatus and Materials
Basic Concept of Matter
Report this note
Timed Exam
Prepare exams with mock exam papers
Learn more
Register for a free Pandai account now
Edit content
×
Loading...
Quiz
Videos
Notes
Account