Question

Which of the following group contain mostly radioactive elements ?

• A. Halogens
• B. Alkaline earth metals
• C. Actinoids
• D. Non metals

Answer 1

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.