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

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## 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.

Exercise

## 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.

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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.

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