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

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Concise Chemistry Class 8 ICSE - Shaalaa.com

Chapter 4: Atomic Structure

Exercise

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.

Chapter 4: Atomic Structure

Exercise
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Concise Chemistry Class 8 ICSE - 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 Fundamental Subatomic Particles Present in an Atom: Electrons, Protons, Neutrons, Nucleus and Extra Nuclear Parts, Concept of Atomic Number and Mass Number, Concept for Atomic Structure, The Combining Capacity of Elements.

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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