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Question 9: The ion of an element has 3 positive charges. Mass
Science Exemplar
Science Exemplar

Class 9

NCERT Exemplar

Publisher:
NCERT
Subject:
Science
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Chapter 1: Matter in Our Surroundings

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2

Chapter 2: Is Matter Around Us Pure?

37 questions

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3

Chapter 3: Atoms and Molecules

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4

Chapter 4: Structure of the Atom

38 questions

Q1
Question 8: Rutherford’s -particle scattering experiment showed that
(i) electrons have negative charge
(ii) the mass and positive charge of the atom is concentrated in the nucleus
(iii) neutron exists in the nucleus
(iv) most of the space in atom is empty
Which of the above statements are correct?
Q2
Question 9:
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
Q3
Question 11:
In a sample of ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
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5

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8

Chapter 8: Motion

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9

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10

Chapter 10: Gravitation

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11

Chapter 11: Work and Energy

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12

Chapter 12: Sound

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13

Chapter 13: Why do We Fall Ill?

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14

Chapter 14: Natural Resourses

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Chapter 15: Improvement in Food Resources

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Question

Question 9:
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

A
13

B
10

C
14

D
16

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Updated on: Mar 19, 2023

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Question 9:
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
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Text SolutionText solutionverified iconVerified

Answer: Mass number of the atom = 27
Number of neutrons = 14
Number of protons = 27 − 14 = 13
Number of electrons in the atom = 13
Number of electrons in ion with 3 positive charges = 13 − 3 = 10

Hence, the correct answer is option (b).
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Question 8: Rutherford’s -particle scattering experiment showed that
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The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
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Question Text
Question 9:
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
Updated OnMar 19, 2023
TopicStructure of the Atom
SubjectScience
ClassClass 9
Answer TypeText solution:1 Video solution: 4
Upvotes474
Avg. Video Duration6 min