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Which of the following pairs are isotopes?

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Important Questions on Structure of Atom

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General Science for Competitive Exams>Chapter 10 - Structure of Atom>EXERCISE>Q 20
Which of the following have equal number of neutrons and protons?
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General Science for Competitive Exams>Chapter 10 - Structure of Atom>EXERCISE>Q 21
The number of electrons in an element with atomic number X and atomic mass Y will be:
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General Science for Competitive Exams>Chapter 10 - Structure of Atom>EXERCISE>Q 22
Which of the following has a charge of +1 and a mass of 1 amu?
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General Science for Competitive Exams>Chapter 10 - Structure of Atom>EXERCISE>Q 24
Which of the following isotopes is used as the standard for atomic mass?
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General Science for Competitive Exams>Chapter 10 - Structure of Atom>EXERCISE>Q 25
Which of the following is not a basic particle of an element?
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General Science for Competitive Exams>Chapter 10 - Structure of Atom>EXERCISE>Q 27
While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation?
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General Science for Competitive Exams>Chapter 10 - Structure of Atom>EXERCISE>Q 28
Which one of the following statement is not true?
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General Science for Competitive Exams>Chapter 10 - Structure of Atom>EXERCISE>Q 29

Dalton's atomic theory successfully explained:

(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions