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Isotopes, Isobars, and Isotones

29 MCQ questions with answers and explanations · page 1 of 2

Test yourself▶ 25 question test

Q1. Two atoms are called isotopes if

  1. AThey have the same number of neutrons but different mass numbers.
  2. BThey have the same atomic number but different mass numbers.
  3. CThey have the same sum of protons and neutrons, but different numbers of protons.
  4. DThey have the same number of neutrons but different radioactive moment modes.
Show answer & explanation

Answer: B) They have the same atomic number but different mass numbers.

Q2. The difference between isotopes of an element is due to the presence of different numbers of

  1. AProton
  2. BNeutron
  3. Celectron
  4. Dphoton
Show answer & explanation

Answer: B) Neutron

Q3. An isotope of an atomic nucleus is that which has ____

  1. AThe number of neutrons is the same, but the number of protons is different.
  2. BThe number of protons is the same, but the number of neutrons is different.
  3. CThe number of protons and neutrons is the same
  4. DBoth protons and neutrons have different numbers.
Show answer & explanation

Answer: B) The number of protons is the same, but the number of neutrons is different.

Q4. In what properties do two isotopes of an element differ?

  1. Aneutron number and mass number
  2. BNeutron number and atomic number
  3. CProton number and electron number
  4. DAtomic mass and atomic number
Show answer & explanation

Answer: A) neutron number and mass number

Q5. What is the number of isotopes of hydrogen?

  1. A2
  2. B3
  3. C4
  4. D5
Show answer & explanation

Answer: B) 3

Q6. Which of the following is not an isotope of hydrogen?

  1. AProtium
  2. BDeuterium
  3. CTritium
  4. DTransium
Show answer & explanation

Answer: D) Transium

Q7. The radioactive isotope of hydrogen is called ____.

  1. ADeuterium
  2. BProtium
  3. CRadium
  4. DTritium
Show answer & explanation

Answer: D) Tritium

Q8. What do you call ⁸0¹⁶, ⁸0¹⁷ and ⁸0¹⁸?

  1. AIsotopic
  2. BIsocomponents
  3. CEquilibrium
  4. DSamnetronic
Show answer & explanation

Answer: A) Isotopic

Q9. What are ¹⁷CI³⁵ and ¹⁷CI ³⁷?

  1. ACompound
  2. BIsotopic
  3. Chomogeneous
  4. Disothermal
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Answer: B) Isotopic

Q10. Which isotopes are found in the largest number?

  1. AUranium
  2. BHydrogen
  3. CCesium
  4. DLed
Show answer & explanation

Answer: C) Cesium

Q11. The number of isotopes of caesium is_

  1. A15
  2. B17
  3. C23
  4. D36
Show answer & explanation

Answer: D) 36

Q12. Which isotope is used in radioactive dating to determine the age of rocks?

  1. AUranium
  2. BLutonium
  3. CThorium
  4. DCarbon
Show answer & explanation

Answer: A) Uranium

Q13. Which isotope is used to detect the condition of blood clots in the circulatory system?

  1. AOn-2
  2. BCo-60
  3. CAs-74
  4. DI-131
Show answer & explanation

Answer: A) On-2

Q14. Cobalt-60 is commonly used in radiation therapy for diseases such as cancer because it emits ____

  1. AAlpha rays
  2. BBeta rays
  3. CGamma rays
  4. DAll of these
Show answer & explanation

Answer: C) Gamma rays

Q15. Which radioisotope is used to control blood cancer (leukemia)?

  1. APhosphorus-32
  2. BCobalt-60
  3. CIodine 131
  4. DSodium 24
Show answer & explanation

Answer: B) Cobalt-60

Q16. Match List-I with List-II and select the correct answer from the codes given below the lists. List-I (Radioisotopes) List-II (Diagnostic uses) A. Arsenic-74 1. Hyperactivity of thyroid gland B. Cobalt-60 2. Blood disorders C. Iodine 131 3. Tumor D. Sodium 24 4. Cancer Code:

  1. AABCD
  2. BABCD
  3. CABCD 3 4 1 2
  4. DABCD 4 3 2 1
Show answer & explanation

Answer: C) ABCD 3 4 1 2

Q17. Nuclei having the same number of neutrons but different number of protons are called ____.

  1. Aisoelectronic
  2. Bisothermal
  3. CIsotopic
  4. DSamnetronic
Show answer & explanation

Answer: D) Samnetronic

Q18. Isotones are ____

  1. Asame number of protons
  2. Bsame number of neutrons
  3. Cthe same number of nucleons
  4. DNone of these
Show answer & explanation

Answer: B) same number of neutrons

Q19. There are isotones which have ____

  1. AThe atomic number is the same and the atomic weight is the same
  2. BDifferent atomic numbers and same atomic weights
  3. CBoth atomic number and atomic weight different
  4. DDifferent atomic number and atomic mass but same number of neutrons
Show answer & explanation

Answer: D) Different atomic number and atomic mass but same number of neutrons

Q20. What are ³⁶Kr ⁸⁶ and ³⁷Rb ⁸⁷ called?

  1. Aisoelectronic
  2. Bisothermal
  3. CSamnetronic
  4. DIsotopic
Show answer & explanation

Answer: C) Samnetronic

Q21. The isotonic group in the following is-

  1. A⁶C¹²,⁷N¹⁴,⁸O¹⁶
  2. B⁶C¹²,⁷N¹⁴,⁸O¹⁸
  3. C⁶C¹²,⁷N¹⁵,⁸O¹⁶
  4. D⁶C¹⁴,⁷N¹⁵,⁸O¹⁶
Show answer & explanation

Answer: D) ⁶C¹⁴,⁷N¹⁵,⁸O¹⁶

Q22. ³Li⁷ and ⁴ Be⁸ is_

  1. Aisotopes
  2. BIsobars
  3. CIsotone
  4. Disomer
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Answer: C) Isotone

Q23. ¹⁵ P³¹ and ¹⁴Si³⁰ are

  1. AIsotopic
  2. Bisothermal
  3. Cisoelectronic
  4. DSamnetronic
Show answer & explanation

Answer: D) Samnetronic

Q24. Ions that have the same number of electrons are called ____.

  1. AIsotopic
  2. Bisothermal
  3. CSamnetronic
  4. DSamnetronic
Show answer & explanation

Answer: D) Samnetronic

Q25. With what is Al¹³+ is isoelectronic?

  1. ACI
  2. BAl
  3. CS
  4. DF
Show answer & explanation

Answer: D) F

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