Which statement describes the properties of lanthanoids and actinoids?

Question

They are brittle and dull, and they tend to conduct both electricity and thermal energy.
They are malleable and lustrous, and they tend to conduct both electricity and thermal energy.
They are brittle and dull, and they tend to be poor conductors of both electricity and thermal energy.
They are malleable and lustrous, and they tend to be poor conductors of both electricity and thermal energy

Answer 1

The properties of lanthanoids and actinoids can be best described by the statement:

They are brittle and dull, and they tend to conduct both electricity and thermal energy.

Lanthanoids tend to have some metallic luster but can also be dull. Both lanthanoids and actinoids generally exhibit brittleness, particularly at room temperature, and they are known for their ability to conduct electricity and thermal energy, although this may vary among specific elements within these series.