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Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 4 - Atomic Structure & Chemical Bonding [Latest edition]

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Class 9 Simplified ICSE Chemistry - Shaalaa.com

Chapter 4: Atomic Structure & Chemical Bonding

ExerciseAdditional QuestionsAtomic Structure

Exercise

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 4 Atomic Structure & Chemical Bonding Exercise

Exercise | Q 1

\[\ce{^24_12Mg}\] and \[\ce{^26_12Mg}\] are symbols of isotopes of magnesium.

(a) Compare the atoms of these isotopes with respect to :
i. the composition of their nuclei
ii. their electronic configurations

(b) Give reasons why the two isotopes of magnesium have different mass numbers.

Exercise | Q 1

From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.

Exercise | Q 1

Sulphur has an atomic number of 16 and a mass number of 32. State the number of protons and neutrons present in the nucleus of sulphur.

Exercise | Q 1

Five atoms are labelled V to Z

Atoms Mass Number Atomic Number
V 40 20
W 19 9
X 7 3
Y 16 8
Z 14 7
  1. Which one of these atoms 
    (1) contains 7 protons;
    (2) has an electronic configuration 2, 7?
  2. Write down the formula of the compound formed by atoms X and Y.
Exercise | Q 1

Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one:

  1. forms anion – negative ion;
  2. forms cation – positive ion;
  3. has 4 electrons in the outermost orbit. [Y, Z, X]
Exercise | Q 1

Write down the electronic configuration of the following 

  1. 2713X,
  2. 3517Y.

Write down the number of electrons in X and neutrons in Y and the formula of the compound formed by X and Y.[XY3]

Exercise | Q 1

According to Dalton’s Atomic Theory, atoms of the same element are identical in all respects. But according to the Modern Atomic Theory, this postulate is proved wrong. Explain.

Exercise | Q 1

What are isotopes?

Exercise | Q 1.1

Define the term of atomic number.

Exercise | Q 1.1

The atom of aluminium is represented by 27Al13. Write down the number of electrons in the different orbits or shells in one atom of aluminium.

Exercise | Q 1.1

Define: Proton

Exercise | Q 1.2

What is the significance of the number of protons found in the atoms of different elements?

Exercise | Q 1.2

Define the term of mass number.

Exercise | Q 1.2

The atom of aluminium is represented by 27Al13. Write down the number of protons in the different orbits or shells in one atom of aluminium.

Exercise | Q 1.3

Define the term of the electron.

Exercise | Q 1.3

The atom of aluminium is represented by 27Al13. Write down the number of neutrons in the different orbits or shells in one atom of aluminium.

Exercise | Q 1.4

The atom of aluminium is represented by 27Al13. Write down the number of the arrangement of electrons in the different orbits or shells in one atom of aluminium.

Exercise | Q 2

Give a simple diagram to show the arrangement of the electrons in an atom of sulphur.

Exercise | Q 2

Chlorine is an element of atomic number 17. It is a mixture of two isotopes having mass number of 35 and 37.

  1. What is meant by “atomic number of an element”? What do you understand by an ‘atom’
  2. Write down the electronic configuration of the chlorine atom.
  3. State the number of protons, electrons, and neutrons in the following isotopes: 35Cl1737Cl17
  4. Explain why the two atoms in (iii) above have the same chemical reactions.
  5. If molten magnesium chloride is electrolyzed suggest a suitable electrode [anode].
Exercise | Q 2

Ordinary chlorine gas has two isotopes: \[\ce{^35_17Cl}\] and \[\ce{^37_17Cl}\] in the ratio of 3 : 1. Calculate the relative atomic mass [atomic weight] of chlorine.

Exercise | Q 2

Name the element which does not contain any neutrons in its nucleus.

Exercise | Q 2

What is the relation between the number of protons and the number of electrons in an atom?

Exercise | Q 2.1

Write down the mass number of the atom having 20 neutrons and 15 protons.

Exercise | Q 2.2

Write down the number of neutrons in the nucleus of an atom having atomic number 17 and mass number 37.

Exercise | Q 3

Elements A, B and C have atomic numbers 9, 20 and 10 respectively.

  1. State which one is
    (1) a non-metal,
    (2) a metal,
    (3) chemically inert.[A,B,C]
  2. Write down the formula of the compound formed by two of the above elements.[BA2]
Exercise | Q 3

What would be the reason for an element to have atoms with different mass numbers?

Exercise | Q 4

Copy and complete the following table relating to the atomic structure of some elements:

Element Atomic Number Mass Number Number of protons Number of Neutrons Number of Electrons
Beryllium 4 9      
Fluorine 9     10  
Sodium       12 11
Aluminium   27     13
Phosphorus   31 15    
Exercise | Q 4.1

Define: Proton

Exercise | Q 4.2

Define: Electron

Exercise | Q 4.3

Define: Neutron

Exercise | Q 5.1

The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium

Exercise | Q 5.2

The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus

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Additional Questions

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 4 Atomic Structure & Chemical Bonding Additional Questions

Additional Questions | Q 1.1

State Dalton's atomic theory.

Additional Questions | Q 1.2

How does the Modern atomic theory contradict and correlate with Dalton's atomic theory?

Additional Questions | Q 2.1

Explain in brief the experimental proof which led to the discovery of –

Electrons

Additional Questions | Q 2.2

Explain in brief the experimental proof which led to the discovery of –

Protons

Additional Questions | Q 2.3

Explain in brief the experimental proof which led to the discovery of –

Atomic nucleus

Additional Questions | Q 2.4

Explain in brief the experimental proof which led to the discovery of –

Neutrons

Additional Questions | Q 3

State in brief the drawbacks of Rutherford's atomic model correlating them with the postulates of Bohr’s atomic model.

Additional Questions | Q 4.1

What is meant by the term subatomic particles

Additional Questions | Q 4.2

What is meant by the term nucleus

Additional Questions | Q 4.3

What is meant by the term orbits

Additional Questions | Q 4.4

Define the term of atomic number.

Additional Questions | Q 4.5

Define the term of mass number.

Additional Questions | Q 5.1

Represent a proton ‘p’ in term of its symbol showing the subscript and superscript value.

Additional Questions | Q 5.2

Represent an electron ‘e’ in term of its symbol showing the subscript and superscript value.

Additional Questions | Q 5.3

Represent a neutron ‘n’ in term of its symbol showing the subscript and superscript value.

Additional Questions | Q 6.1

What are ‘energy levels’?

Additional Questions | Q 6.2

Explain the arrangement and distribution of electrons in the various shells with reference to an atom in general and to an atom of potassium ‘3919K’ with special reference to the 2n2 rule.

Additional Questions | Q 7

An element ‘A’ has mass number 23 and atomic number 11. State the –

  1. no. of neutrons in its shell,
  2. electronic configuration of the element ‘A’.
Additional Questions | Q 8.1

The following element is given \[\ce{_3U}\]. State the electronic configuration and state whether it is a metal, non-metal, or inert gas.

Additional Questions | Q 8.2

The following element is given \[\ce{_6V}\]. State the electronic configuration and state whether it is a metal, non-metal, or inert gas.

Additional Questions | Q 8.3

The following element is given \[\ce{_9W}\]. State the electronic configuration and state whether it is a metal, non-metal, or inert gas.

Additional Questions | Q 8.4

The following element is given \[\ce{_14X}\]. State the electronic configuration and state whether it is a metal, non-metal, or inert gas.

Additional Questions | Q 8.5

The following element is given \[\ce{_18Y}\]. State the electronic configuration and state whether it is a metal, non-metal, or inert gas.

Additional Questions | Q 8.6

The following element is given \[\ce{_20Z}\]. State the electronic configuration and state whether it is a metal, non-metal, or inert gas.

Additional Questions | Q 9.1

Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:

\[\ce{^12_6C}\]

Additional Questions | Q 9.2

Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:

\[\ce{^23_11Na}\]

Additional Questions | Q 9.3

Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:

\[\ce{^31_15P}\]

Additional Questions | Q 9.4

Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:

\[\ce{^39_19K}\]

Additional Questions | Q 9.5

Draw the geometric atomic structure of the following atom showing the number of electrons, protons and neutrons in them:

\[\ce{^40_20Ca}\]

Additional Questions | Q 10.1

What are isotopes?

Additional Questions | Q 10.2

Give the reason why isotopes have the same chemical but different physical properties.

Additional Questions | Q 11

Draw the geometric atomic structure of the three isotopes of hydrogen and the two isotopes of chlorine.

Additional Questions | Q 12

Four elements A, B, C, D are given :

  • A shows the presence of 20 neutrons, 17 protons and 17 electrons.
  • B shows the presence of 18 neutrons, 17 protons and 17 electrons.
  • C shows the presence of 10 neutrons, 9 protons and 10 electrons.
  • D shows the presence of 4 neutrons, 3 protons and 2 electrons.

State which of the above is –

  1. an anion
  2. a cation
  3. a pair of isotopes.

Write the formula of the compound formed between D and C.

Additional Questions | Q 13.1

What are the noble gases?

Additional Questions | Q 13.2

Give a reason why noble gases have a stable electronic configuration.

Additional Questions | Q 14

Explain the reason for the chemical activity of an atom with reference to its electronic configuration.

Additional Questions | Q 15.1

Differentiate between the term Stable and unstable electronic configuration.

Additional Questions | Q 15.2

Differentiate between the term Duplet and octet rule.

Additional Questions | Q 16.1

Explain the octet rule for the formation of –

Sodium chloride from a sodium atom and a chlorine atom.

Additional Questions | Q 16.2

Explain the octet rule for the formation of –

Nitrogen molecule from two nitrogen atoms.

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Atomic Structure

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 4 Atomic Structure & Chemical Bonding Atomic Structure

Atomic Structure | Q 1.1

Select the correct answer from the answer in the bracket to complete the sentence.

An element has electronic configuration 2, 8, 1 and 12 neutrons. Its mass no. is ________.

  • 11

  • 23

  • 12

Atomic Structure | Q 1.2

Select the correct answer from the answer in the bracket to complete the sentence.

The maximum number of electrons in M-shell is _______.

  • 8

  • 32

  • 18

Atomic Structure | Q 1.3

Select the correct answer from the answer in the bracket to complete the sentence.

Isotopes have same _________.

  • no. of neutrons

  • electronic configuration

  • atomic masses

Atomic Structure | Q 1.4

Select the correct answer from the answer in the bracket to complete the sentence.

An ________ is capable of independent existence in solution.

  • atom

  • ion

Atomic Structure | Q 1.5

Select the correct answer from the answer in the bracket to complete the sentence.

An atom with electronic configuration 2, 7 and mass number 19 will have ________ neutrons.

  • 8

  • 10

  • 12

Atomic Structure | Q 2.1

Give a reason

Physical properties of isotopes are different.

Atomic Structure | Q 2.2

Give a reason for the following:

The mass number of an atom is slightly less than the actual atomic mass.

Atomic Structure | Q 2.3

Give a reason for the following:

The shells surrounding the nucleus of an atom are also called ‘energy levels’.

Atomic Structure | Q 2.4

Give a reason for the following:

Helium is chemical extremely unreactive.

Atomic Structure | Q 2.5

Give a reason for the following:

The mass number of an atom is slightly less than the actual atomic mass.

Atomic Structure | Q 3.1

Differentiate between the following term:

Electron and proton

Atomic Structure | Q 3.2

Differentiate between the following term:

Atomic number and mass number

Atomic Structure | Q 3.3

Differentiate between the following term:

Nucleus and nucleons

Atomic Structure | Q 3.4

Differentiate between the following term:

Valence shell and penultimate shell

Atomic Structure | Q 3.5

Differentiate between the term Duplet and octet rule.

Atomic Structure | Q 4.1

Name or state the following.

The three isotopes of hydrogen.

Atomic Structure | Q 4.2

Name or state the following.

Two elements having the same number of protons and electrons but a different number of neutrons.

Atomic Structure | Q 4.3

Name or state the following.

The valency of an element whose electronic configuration is 2, 8, 3.

Atomic Structure | Q 4.4

Name the following:

The shell closest to the nucleus of an atom 

Atomic Structure | Q 4.5

Name the following:

An element having valency 'zero'

Atomic Structure | Q 5

State the number of neutrons in each of the atoms A to E. Also state which of the atoms A to E is a metal.

Atomic Structure | Q 6

Match the elements A to E in List 1 with their valencies in List 2 and with their nature in List 3.

List 1 [Elements] List 2 [Valency] List 3
A: At. no. 7, Mass no. 14 1. −3 X: Metal
B: Elec. conf. 2, 8 2. +1 Y: Non-metal
C: Neutrons 14, electrons 13 3. +3 Z: Noble gas
D: Neutrons 22, protons 18 4. +2  
E: Elec. config. 2, 8, 1 5. 0  
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Chapter 4: Atomic Structure & Chemical Bonding

ExerciseAdditional QuestionsAtomic Structure
Class 9 Simplified ICSE Chemistry - Shaalaa.com

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 4 - Atomic Structure & Chemical Bonding

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 4 (Atomic Structure & Chemical Bonding) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Class 9 Simplified ICSE Chemistry solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Viraf J. Dalal textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 9 Simplified ICSE Chemistry chapter 4 Atomic Structure & Chemical Bonding are Atomic Number, Mass Number, Concept of Isotopes, Concept of Electrons Distributed in Different Orbits (Shells), Introduction to Atomic Structure and Chemical Bonding, Discovery of Electrons, Discovery of Protons, Discovery of Nucleus, Bohr’S Model of Atom, Neutrons, Atom - Its Structure, Bohr-bury Scheme, Valency Electrons, Reason for Chemical Activity of an Atom, Electrovalent (Or Ionic) Bond, Covalent (Molecular) Bond, Characteristic Properties of Electrovalent Compounds.

Using Viraf J. Dalal Class 9 solutions Atomic Structure & Chemical Bonding exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Viraf J. Dalal Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 9 prefer Viraf J. Dalal Textbook Solutions to score more in exam.

Get the free view of chapter 4 Atomic Structure & Chemical Bonding Class 9 extra questions for Class 9 Simplified ICSE Chemistry and can use Shaalaa.com to keep it handy for your exam preparation

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