quiz

Isotopes Isobars and Allotropes

1. Atoms with the same number of protons but different numbers of neutrons are called:

  • A) Ions
  • B) Isotopes
  • C)  Molecules
  • D)  Compounds
B) Isotopes Explanation

2. What does the term “isotopically pure” mean?

  • A) The substance consists of only one stable isotope
  • B) The substance consists of only one radioactive isotope
  • C) The substance consists of only one element.
  • D) The substance consists of only one ion
A) The substance consists of only one stable isotope Explanation

3. Which of the following elements has three main isotopes, each with a different number of neutrons?

  • A) Oxygen
  • B)  Carbon
  • C) Nitrogen
  • D) Hydrogen
C) Carbon Explanation

4. Which of the following elements has the largest number of stable isotopes?

  • A) Tin
  • B) Uranium
  • C)  Carbon
  • D) Technetium
A) Tin Explanation

5. What is the term used to describe the ability of an element to exist in one of many structural forms?

  • A) Polymorphism
  • B) Isotropy
  • C) Allotropy
  • D) Isomerism
C) Allotropy Explanation

6. Which of the following is an example of an element that exhibits allotropy with various structural forms?

  • A) Hydrogen
  • B)  Oxygen
  • C) Carbon
  • D) Nitrogen
C) Carbon Explanation

7. How many naturally occurring elements are considered primordial and either stable or weakly radioactive?

  • A) 11
  • B) 83
  • C) 94
  • D) 66
B) 83 Explanation

8. Which of the following allotropes of carbon has a single layer of carbon atoms and is known for its exceptional strength?

  • A) Diamond
  • B) Graphite
  • C) Amorphous carbon
  • D)  Graphene
D) Graphene Explanation

9. Which of the following formulas represents heavy water?

  • A) H2O
  • B) D2O
  • C) 2H2O
  • D) T2O
 B) D2O Explanation

10. Who coined the term “isobars” for nuclides?

  • A) Marie Curie
  • B) Alfred Walter Stewart
  • C) Niels Bohr
  • D) Ernest Rutherford
B) Alfred Walter Stewart Explanation

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