Complete the given table with respect to the formation of aluminium fluoride. Element Atomic number Electronic configuration Number of electrons donated or received Al 13 _____ _____ F 9 _____ _____

Electronic configuration is the distribution of electrons in different shells of an atom. Similarly, the number of electrons lost, donated or shared is the valency of that element. During the formation of aluminium fluoride, the electron transfer takes place. Therefore, the given table can be completed as, Element Atomic number Electronic configuration Number of electrons donated or received Al 13 2 , 8 , 3 3 (Donated) F 9 2 , 7 1 (Three chlorine atoms accept one electron each)

Write the chemical formula of the following compounds. Sodium oxide Aluminium chloride Aluminium oxide

Valency has a prominent role in deciding the chemical formula of a compound. That is, it is related with the outermost shell electrons that take part during bond formation. Here, the given compounds contain sodium, oxygen, chlorine and aluminium who have a valency of one, two, one and three respectively. Therefore, by interchanging the valencies of the constituent elements, the chemical formula of the following compounds can be given as, Chemical name Chemical formula Sodium oxide Na 2 O Aluminium chloride AlCl 3 Aluminium oxide Al 2 O 3

Answer the following questions given below related to the chemical formula of aluminium oxide. Which are the constituent elements of aluminium oxide? What are the valencies of aluminium and oxygen? Write the symbols of constituent elements together in such a way that that symbol of the element having lesser electronegativity comes first and then write the chemical formula of aluminium oxide.

Aluminium oxide is an ionic compound formed from the elements aluminium and oxygen. Aluminium has three electrons in its outermost shell and that of oxygen has six electrons in it. Therefore, aluminium can donate three electrons to attain stability and oxygen can gain two electrons to attain stability. Therefore, the valencies of aluminium and oxygen are three and two respectively. The symbols of constituent elements together in such a way that that symbol of the element having lesser electronegativity comes first can be given as AlO . That is, oxygen is the non-metal having higher electronegativity than aluminium. By interchanging the valencies of the constituent atoms, and giving them as subscripts, we can give the chemical formula of aluminium oxide as Al 2 O 3 .

Answer the following questions given below related to the chemical formula of carbon dioxide. What are the constituent elements in it? Write its chemical formula.

Carbon dioxide is a covalent compound formed from the constituent elements such as carbon and oxygen. Using the valencies of the constituent elements, we can write the chemical formula of carbon dioxide. That is, carbon atom has four electrons in its outermost shell and that of oxygen atom has six electrons in it. Therefore, the valency of carbon atom is four and that of oxygen is two. Hence, by interchanging the valencies, its chemical formula will be C 2 O 4 . It can be simplified into CO 2

Complete the table given below. Elements Compound Name Valency Name Valency Name Chemical formula Potassium 1 Oxygen 2 Potassium oxide K 2 O Zinc 2 Bromine 1 _____ _____ Carbon _____ Chlorine ____ Carbon tetrachloride CCl 4 Magnesium 2 Fluorine 1 _____ _____

Valency is the number of electrons lost, gained or shared by an atom during a chemical reaction. By interchanging the valencies of the constituent elements, we can write the chemical formula of a compound. Therefore, the given table can be completed as, Elements Compound Name Valency Name Valency Name Chemical formula Potassium 1 Oxygen 2 Potassium oxide K 2 O Zinc 2 Bromine 1 Zinc bromide ZnBr 2 Carbon 4 Chlorine 1 Carbon tetrachloride CCl 4 Magnesium 2 Fluorine 1 Magnesium fluoride MgF 2

Kerala Board Solutions for Chapter: Chemical Bonding, Exercise 1: Exercise 1

Author:Kerala Board

Kerala Board Chemistry Solutions for Exercise - Kerala Board Solutions for Chapter: Chemical Bonding, Exercise 1: Exercise 1

Attempt the free practice questions on Chapter 2: Chemical Bonding, Exercise 1: Exercise 1 with hints and solutions to strengthen your understanding. Chemistry Standard IX Part 1 solutions are prepared by Experienced Embibe Experts.

Questions from Kerala Board Solutions for Chapter: Chemical Bonding, Exercise 1: Exercise 1 with Hints & Solutions

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 2 - Chemical Bonding>Exercise 1

Complete the given table with respect to the formation of aluminium fluoride.

Element	Atomic number	Electronic configuration	Number of electrons donated or received
$Al$	$13$	_____	_____
$F$	$9$	_____	_____

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 2 - Chemical Bonding>Exercise 1

How many fluorine atoms are required to receive the electrons donated by aluminium during the formation of aluminium fluoride?

EASY

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 2 - Chemical Bonding>Exercise 1

Write the chemical formula of aluminium fluoride.

MEDIUM

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 2 - Chemical Bonding>Exercise 1

Write the chemical formula of the following compounds.

Sodium oxide
Aluminium chloride
Aluminium oxide

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 2 - Chemical Bonding>Exercise 1>Q •

Answer the following questions given below related to the chemical formula of aluminium oxide.

Which are the constituent elements of aluminium oxide?
What are the valencies of aluminium and oxygen?
Write the symbols of constituent elements together in such a way that that symbol of the element having lesser electronegativity comes first and then write the chemical formula of aluminium oxide.

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 2 - Chemical Bonding>Exercise 1>Q •

Answer the following questions given below related to the chemical formula of carbon dioxide.

What are the constituent elements in it?
Write its chemical formula.

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 2 - Chemical Bonding>Exercise 1>Q •

Complete the table given below.

Elements				Compound
Name	Valency	Name	Valency	Name	Chemical formula
Potassium	$1$	Oxygen	$2$	Potassium oxide	$K_{2} O$
Zinc	$2$	Bromine	$1$	_____	_____
Carbon	_____	Chlorine	____	Carbon tetrachloride	${CCl}_{4}$
Magnesium	$2$	Fluorine	$1$	_____	_____

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 1>Chapter 2 - Chemical Bonding>Exercise 1

Some elements and their valencies are given below. Using these, write the chemical formulae of four compounds.

Elements	Valency
$O$	$2$
$Cl$	$1$
$Li$	$1$
$Zn$	$2$

Kerala Board Solutions for Chapter: Chemical Bonding, Exercise 1: Exercise 1

Kerala Board Chemistry Solutions for Exercise - Kerala Board Solutions for Chapter: Chemical Bonding, Exercise 1: Exercise 1

Questions from Kerala Board Solutions for Chapter: Chemical Bonding, Exercise 1: Exercise 1 with Hints & Solutions

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