Which statement describes the properties of lanthanoids and actinoids?(1 point)

Question

Responses
They are brittle and dull, and they tend to be poor conductors of 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 brittle and dull, and they tend to conduct both electricity and thermal energy.
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 malleable and lustrous, and they tend to conduct 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 correct statement describing the properties of lanthanoids and actinoids is:

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

Lanthanoids and actinoids are known for being relatively brittle and often appear dull in color. However, they are also metals, and thus, they have the ability to conduct electricity and thermal energy.

Answer 2

An element is highly conductive, highly reactive, soft, and lustrous. The element most likely belongs to which group?(1 point)
Responses
transition metals
transition metals
noble gases
noble gases
metalloids
metalloids
alkali metals

Answer 3

The element described as highly conductive, highly reactive, soft, and lustrous most likely belongs to the alkali metals group. Alkali metals (such as lithium, sodium, and potassium) are known for these characteristics. They are excellent conductors of electricity, are very reactive (especially with water), are soft enough to be cut with a knife, and have a shiny, lustrous appearance.

Answer 4

How does mercury differ from other metals?(1 point)
Responses
It is not lustrous.
It is not lustrous.
It is not solid under normal conditions.
It is not solid under normal conditions.
It does not conduct electricity.
It does not conduct electricity.
It does not chemically react with other elements.

Answer 5

The correct response is:

It is not solid under normal conditions.

Mercury is unique among metals in that it is a liquid at room temperature, whereas most metals are solid.

Answer 6

Based on patterns in the periodic table, which element is the least malleable in its solid state?
(1 point)
Responses
copper (Cu)
copper (Cu)
phosphorus (P)
phosphorus (P)
antimony (Sb)
antimony (Sb)
strontium (Sr)

Answer 7

The least malleable element in its solid state based on the options provided is phosphorus (P).

Phosphorus is a nonmetal, and it is generally brittle in its solid form, especially in its most common allotrope (white phosphorus), contrasting with metals like copper (Cu) and strontium (Sr), which are known for their malleability. Antimony (Sb) is a metalloid and has some malleability but is more brittle compared to typical metals.