Question

____ are stacked in the \in - between\ area of the periodic table because they have the properties of both metals and
noble gases
liquid elements
metalloids
x - rays

Explanation:

Metalloids have properties intermediate between metals and non - metals and are located in the "in - between" area of the periodic table. Noble gases are in group 18 and are non - reactive non - metals. Liquid elements are not a distinct group in that specific "in - between" location. X - rays are not elements on the periodic table.

Answer:

C. Metalloids