Question 24

Elements in group 17 share poor thermal conductivity and poor electrical conductivity.

Elements in group 17, known as halogens, exhibit poor thermal conductivity and poor electrical conductivity due to their molecular structures and bonding characteristics.

A) Poor thermal conductivity

This option is correct because halogens, being nonmetals, typically do not conduct heat well. Their molecular structure lacks free-moving electrons, which are essential for efficient thermal conduction.

B) Good electrical conductivity

This option is incorrect as halogens are nonmetals and do not possess the free electrons necessary for good electrical conductivity. Instead, they are insulators in their elemental forms.

C) Poor electrical conductivity

This option is correct since elements in group 17 do not allow the flow of electric current effectively. Their atomic structure contributes to their poor electrical conductivity, aligning with the characteristics of nonmetals.

D) Good thermal conductivity

This option is incorrect. Halogens do not have the properties that allow them to conduct heat effectively, as they lack the metallic characteristics that facilitate good thermal conduction.

Conclusion

The correct options, poor thermal conductivity and poor electrical conductivity, reflect the inherent properties of group 17 elements as nonmetals. The incorrect options fail to recognize that these elements do not conduct heat or electricity effectively, highlighting their distinct position in the periodic table.