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Question

Which of the following group contain mostly radioactive elements ?


A

Halogens

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B

Alkaline earth metals

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C

Actinoids

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D

Non metals

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Solution

The correct option is C

Actinoids


Explanation for the correct option:

(c) Actinoids

  • In the periodic table, Actinoids are the category that contains the majority of radioactive elements.
  • Since their nuclei are so big, the actinides are all radioactive because they are explosive and emit a lot of energy when they fission spontaneously.
  • The majority of actinides are synthesized in laboratories rather than found in nature.
  • Hence this option is correct

Explanation for the incorrect options:

(A) Halogens

  • Group 17 is known as the Halogen family.
  • Fluorine, chlorine, bromine, iodine, and Astatine are halogens.
  • Among all the halogens, only one element that is astatine is radioactive.
  • Thus, this option is incorrect.

(B) Alkaline earth metals

  • Beryllium, magnesium, calcium, strontium, barium, and radium are alkaline earth metals.
  • Radium is the only element in alkaline earth metal that is radioactive.
  • Thus, this option is incorrect.

(d) Non-metals

  • Nonmetals do not have a very large nucleus enough to make the nucleus stable.
  • so a small nucleus is not enough to make the nucleus stable.
  • Thus, this option is incorrect.

Hence the correct option is (C). The Actinoid groups contain mostly radioactive elements.


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