Question

· malleable & ductile · good conductor · solid at room temp category: metal element 3: silicon properties: · has metallic luster · brittle · semi - conductor · solid at room temp category: metalloid element 5: oxygen properties: · colorless gas · poor conductor · not malleable/ductile · gas at room temp category:

Explanation:

Step1: Recall element categories

Metals are malleable, ductile, good conductors, solid at room temp. Metalloids have some metal/non - metal properties. Non - metals are poor conductors, not malleable/ductile, can be gas at room temp.

Step2: Analyze Oxygen's properties

Oxygen is a colorless gas, poor conductor, not malleable/ductile, gas at room temp. These match non - metal properties.

Answer:

Non - metal