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Selina solutions for Concise Chemistry Class 8 ICSE chapter 4 - Atomic Structure [Latest edition]

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Selina solutions for Concise Chemistry Class 8 ICSE chapter 4 - Atomic Structure - Shaalaa.com
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Chapter 4: Atomic Structure

Exercise
Exercise [Pages 51 - 52]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 4 Atomic Structure Exercise [Pages 51 - 52]

Exercise | Q 1.1 | Page 51

 Fill in the blank

Dalton ................... that atoms could not be divided .

Exercise | Q 1.2 | Page 51

 Fill in the blank

An ion which has a positive charge is called a ..................

Exercise | Q 1.3 | Page 51

 Fill in the blank

 The outermost shell of an atom is known as............................

Exercise | Q 1.4 | Page 51

Fill in the blank

The ..........................of an atom is very hard and dense.

Exercise | Q 1.5 | Page 51

Fill in the blank

Neutrons are .......................... particles having mass equal to that of protons.

Exercise | Q 1.6 | Page 51

Fill in the blank

 Isotopes are the atoms of.......... element having the same atomic number but a different mass number

Exercise | Q 2.1 | Page 51

Write true or false for the following statement

An atom on the whole has a positive charge.

  • True

  • False

Exercise | Q 2.2 | Page 51

Write true or false for the following statement

The maximum number of electrons in the first shell can be 8.

  • True

  • False

Exercise | Q 2.3 | Page 51

 Write true or false for the following statement

The central pad of the atom is called nucleus.

  • True

  • False

Exercise | Q 3.1 | Page 51

 Give the following a suitable word/phrase
The sub-atomic particle with negative charge and negligible mass.

Exercise | Q 3.2 | Page 51

Give the following a suitable word/phrase.

Protons and neutrons present in the nucleus.

Exercise | Q 3.3 | Page 51

 Give the following a suitable word/phrase.

The electrons present in the outermost shell.

Exercise | Q 3.4 | Page 51

Give the following a suitable word/phrase

Arrangement of electrons in the shells of an atom.

Exercise | Q 3.5 | Page 51

 Give the following a suitable word/phrase.

The number of protons present in the nucleus of an atom.

Exercise | Q 3.6 | Page 51

 Give the following a suitable word/phrase.

The sum of the number of protons and neutrons of an atom.

Exercise | Q 3.7 | Page 51

 Give the following a suitable word/phrase.

Atoms of same element with same atomic number but a different mass number.

Exercise | Q 3.8 | Page 51

 Give the following a suitable word/phrase.

The smallest unit of an element which takes part in a chemical reaction.

Exercise | Q 4.1 | Page 51

 Multiple Choice Questions

The outermost shell of an atom is known as

  • valency

  • valence electrons

  • nucleus

  • valence shell

Exercise | Q 4.2 | Page 51

 Multiple Choice Questions

number of valence electrons present in magnesium is

  • two

  • three

  • four

  • five

Exercise | Q 4.3 | Page 51

Multiple Choice Questions

 The sub atomic particle with negative charge is

  • proton

  • neutron

  • electron

  • nucleon

Exercise | Q 4.4 | Page 52

Multiple Choice Questions

If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be

  • 35

  • 17

  • 18

  • 52

Exercise | Q 4.5 | Page 52

Multiple Choice Questions

The number of electrons in an atom is equal to number of

  • protons in a neutral atom

  • neutrons in a neutral atom

  • nucleons in a neutral atom

  • none of the above

Exercise | Q 4.6 | Page 52

 Multiple Choice Questions

 The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

  • mass number

  • atomic number

  • number of electrons

  • all of the above

Exercise | Q 5 | Page 52

Name three fundamental particles of the atom. Give the symbol with charge, on each particle.

Exercise | Q 6.1 | Page 52

Define the term Atomic number. 

Exercise | Q 6.2 | Page 52

Define the term Mass number.

Exercise | Q 6.3 | Page 52

Define the term Nucleons.

Exercise | Q 6.4 | Page 52

Define the term Valence shell.

Exercise | Q 7 | Page 52

Mention briefly the salient features of Dalton’s atomic theory (five points)

Exercise | Q 8.1 | Page 52

What are the two main features of Rutherford’s atomic model?

Exercise | Q 8.2 | Page 52

State its one drawback of Rutherford’s atomic model.

Exercise | Q 9 | Page 52

What are the observations of the experiment done by Rutherford in order to determine the structure of an atom?

Exercise | Q 10 | Page 52

State the mass number, the atomic number, number of neutrons and electronic configuration of the following atoms.
`""^12""_6C`  ,   `""^16""_8O`     ,   `""^19""_9F`  ,   `""^20""_10Ne`     ,  `""_13""Al""^27`   ,   `""_17""Cl""^35` 
Also, draw atomic diagrams for them.

Exercise | Q 11 | Page 52

What is variable valency? Name two elements having variable valency and state their valencies.

Exercise | Q 12 | Page 52

The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement.

Exercise | Q 13.1 | Page 52

Draw the diagrams representing the atomic structures of the following: Nitrogen.

Exercise | Q 13.2 | Page 52

Draw the diagrams representing the atomic structures of the following: Neon

Exercise | Q 14 | Page 52

Explain the rule with example according to which electrons are filled in various energy levels

Exercise | Q 15 | Page 52

The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What is its atomic number and mass number?

Exercise | Q 16.1 | Page 52

What are the two main parts of which an atom is made of?

Exercise | Q 16.2 | Page 52

Where is the nucleus of an atom situated? 

Exercise | Q 16.3 | Page 52

What are orbits or shells of an atom?

Exercise | Q 17 | Page 52

What are isotopes? How does the existence of isotopes contradict Dalton’s atomic theory?

Exercise | Q 18 | Page 52

Complete the table below by identifying A, B, C, D, E and F.

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Chapter 4: Atomic Structure

Exercise
Selina solutions for Concise Chemistry Class 8 ICSE chapter 4 - Atomic Structure - Shaalaa.com

Selina solutions for Concise Chemistry Class 8 ICSE chapter 4 - Atomic Structure

Selina solutions for Concise Chemistry Class 8 ICSE chapter 4 (Atomic Structure) 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 Concise Chemistry Class 8 ICSE 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. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Concise Chemistry Class 8 ICSE chapter 4 Atomic Structure are Atoms: Building Blocks of Matter, Nucleus, Neutrons (n), J. J. Thomson’s Atomic Model, Lord Rutherford’s Atomic model, Structure of an Atom, Atomic Number (Z), Mass Number (A), and Number of Neutrons (n), History of Atom, Atomic Mass, Discovery of Charged Particles in Matter, Electronic Configuration of Atom, Electrons (e), Electronic Configuration of Atom, Protons (p), Isotopes, Valency, Dalton’s atomic theory, Ions (Radicals) and Its Types, Neils Bohr’s Model of an Atom, Valency Electrons, Variable Valency.

Using Selina Class 8 solutions Atomic Structure 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 Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 8 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 4 Atomic Structure Class 8 extra questions for Concise Chemistry Class 8 ICSE and can use Shaalaa.com to keep it handy for your exam preparation

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