Which of the following pairs are isobars? (i) A 26 58 , B 28 58 (ii) X 35 79 , Y 80 35 . Give reasons for your choice.

A 26 58 and B 28 58 are isobars. This is because, they have the same number of nucleons (or mass number) but their atomic numbers (number of protons) are different.

The number of protons, neutrons and electrons in particles A to E are given below: Particle Protons Neutrons Electrons A 17 18 17 B 3 4 2 C 18 22 18 D 17 20 17 E 9 10 10 Giving reasons, find a pair of isotopes from the above particles.

Isotopes are elements with the same atomic number but different mass numbers. It is also defined as atoms with the same number of protons but that have a different number of neutrons. Form the given elements, A and D are isotopes. This is because, they have the same atomic number but different number of neutrons. Atomic number = Number of protons = 17 .

The composition of two atomic particles is given below: X Y Protons 8 8 Neutrons 8 9 Electrons 8 8 What is the mass number of X?

Mass number is the sum of the number of neutrons and protons in an atom. Therefore, the mass number of X = 8 + 8 = 16 .

The composition of two atomic particles is given below: X Y Protons 8 8 Neutrons 8 9 Electrons 8 8 What is the mass number of Y?

Mass number is the sum of the number of neutrons and protons. A = Z + N Where, A is mass number, Z is the atomic number which is equals to the number of protons in the atom and N is the number of neutrons. Given, no.of protons in Y = 8 ; no.of neutrons in Y = 9 Therefore, the mass number of Y = 8 + 9 = 17 .

The composition of two atomic particles is given below: X Y Protons 8 8 Neutrons 8 9 Electrons 8 8 What is the relation between X and Y?

Isotopes are elements with the same atomic number but different mass numbers. It is also defined as atoms with the same number of protons but that have a different number of neutrons. The relation between X and Y is that they are isotopes. That is, they have the same number of protons but different number of neutrons.

The composition of two atomic particles is given below: X Y Protons 8 8 Neutrons 8 9 Electrons 8 8 Which element/elements do they represent?

The elements of X and Y represent the isotopes of oxygen. That is, the atomic number of both the elements is 8 . Therefore, it represents oxygen isotopes. Isotopes are elements with the same atomic number but different mass numbers. It is also defined as atoms with the same number of protons but that have a different number of neutrons.

Lakhmir Singh and Manjit Kaur Solutions for Chapter: Structure of Atom, Exercise 2: Very Short Answer Type Questions

Author:Lakhmir Singh & Manjit Kaur

Lakhmir Singh Chemistry Solutions for Exercise - Lakhmir Singh and Manjit Kaur Solutions for Chapter: Structure of Atom, Exercise 2: Very Short Answer Type Questions

Attempt the practice questions on Chapter 4: Structure of Atom, Exercise 2: Very Short Answer Type Questions with hints and solutions to strengthen your understanding. Science for Ninth class Part 2 Chemistry solutions are prepared by Experienced Embibe Experts.

Questions from Lakhmir Singh and Manjit Kaur Solutions for Chapter: Structure of Atom, Exercise 2: Very Short Answer Type Questions with Hints & Solutions

EASY

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 5

Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.

HARD

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 57

Composition of the nuclei of two atomic species A and B is given as under :

A B

Protons: $18$ $20$

Neutrons: $22$ $20$

Give the mass numbers of A and B. What is the relation between the two species and which element or elements they represent?

HARD

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 58

Which of the following pairs are isobars?

(i) ${}_{26}^{58}A, {}_{28}^{58}B$ (ii) ${}_{35}^{79}X, {}_{80}^{35}Y$ .

Give reasons for your choice.

HARD

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 59

The number of protons, neutrons and electrons in particles A to E are given below:

Particle	Protons	Neutrons	Electrons
A	17	18	17
B	3	4	2
C	18	22	18
D	17	20	17
E	9	10	10

Giving reasons, find a pair of isotopes from the above particles.

HARD

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 60

The composition of two atomic particles is given below:

	X	Y
Protons	8	8
Neutrons	8	9
Electrons	8	8

What is the mass number of X?

HARD

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 60

The composition of two atomic particles is given below:

	X	Y
Protons	8	8
Neutrons	8	9
Electrons	8	8

What is the mass number of Y?

MEDIUM

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 60

The composition of two atomic particles is given below:

	X	Y
Protons	8	8
Neutrons	8	9
Electrons	8	8

What is the relation between X and Y?

MEDIUM

9th CBSE

IMPORTANT

Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 60

The composition of two atomic particles is given below:

	X	Y
Protons	8	8
Neutrons	8	9
Electrons	8	8

Which element/elements do they represent?

Lakhmir Singh and Manjit Kaur Solutions for Chapter: Structure of Atom, Exercise 2: Very Short Answer Type Questions

Lakhmir Singh Chemistry Solutions for Exercise - Lakhmir Singh and Manjit Kaur Solutions for Chapter: Structure of Atom, Exercise 2: Very Short Answer Type Questions

Questions from Lakhmir Singh and Manjit Kaur Solutions for Chapter: Structure of Atom, Exercise 2: Very Short Answer Type Questions with Hints & Solutions

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