What physical property is characteristic of group 2 elements in solid form?

Group 2 elements, also known as alkaline earth metals, are characterized by their metallic structure. In solid form, they have delocalized electrons that contribute to electrical conductivity, though they do not conduct electricity as effectively when solid compared to when they are molten. However, the correct answer highlights that when these metals are heated to their molten state, the increased movement of the delocalized electrons allows for enhanced electrical conductivity, making them good conductors of electricity in this form.

In solid form, these elements typically exhibit characteristics such as high melting points and are relatively dense, rather than being gases at room temperature or showing low melting points. Therefore, while they may not be the best conductors in solid state compared to their molten state, the notion of being good conductors when in the molten state accurately describes a significant property of group 2 elements.