Three different atoms of oxygen are represented as O 8 16 , O 8 17 and O 8 18 . What is the usual name for such atoms of an element?

The usual name given for such atoms are known as isotopes. That is, they are the atoms of the same element having same atomic number but different mass number.

Three different atoms of oxygen are represented as O 8 16 , O 8 17 and O 8 18 . What is the usual name for such atoms of an element?

The usual name given for such atoms are known as isotopes. That is, they are the atoms of the same element having same atomic number but different mass number.

Three different atoms of oxygen are represented as O 8 16 , O 8 17 and O 8 18 . Give the nuclear composition of O 8 18 .

The nuclear composition of O 8 18 are: (i) The number of protons = number of electron = 8 . (ii) Mass number = 18 . (ii) Mass number = Number of protons + Number of neutrons The number of neutrons = 18 − 8 = 10 .

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.

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Three different atoms of oxygen are represented as ${}_{8}^{16}O, {}_{8}^{17}O and {}_{8}^{18}O$ . What is the usual name for such atoms of an element?

Important Questions on Structure of Atom

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 55

Three different atoms of oxygen are represented as ${}_{8}^{16}O, {}_{8}^{17}O and {}_{8}^{18}O$ . Give the nuclear composition of ${}_{8}^{18}O$ .

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Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Questions Based on High Order Thinking Skills (HOTS)>Q 56

The atomic species A and B have a different number of protons but the same number of nucleons. On the other hand, the atomic species X and Y have the same number of protons but a different number of nucleons. Which pair is an example of isobars? Why?

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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?

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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.

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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

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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

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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?

Three different atoms of oxygen are represented as O816, O817 and O818. What is the usual name for such atoms of an element?

Important Questions on Structure of Atom

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Three different atoms of oxygen are represented as ${}_{8}^{16}O, {}_{8}^{17}O and {}_{8}^{18}O$ . What is the usual name for such atoms of an element?