Answer:
The correct answer is A. on the left side.
Explanation:
There are two opposite categories: that of metals and that of nonmetals. With intermediate physical and chemical properties, a third group is defined: that of metalloids.
Metals are chemical elements, extracted from the earth or produced by metal alloys, which serve - mostly - as conductors of heat and electricity. They have all or a large part of the following physical properties: solid state at normal temperature, except mercury, which is liquid; opacity, except in very thin layers; good electrical and thermal conductors; brilliant, once polished, and crystalline structure in a solid state.
Metals are separated from Non-Metale in the periodic table by a diagonal line of elements. The elements to the left of this diagonal are metals, while the elements to the right are nonmetals. The elements that make up this diagonal - boron, silicon, germanium, arsenic, antimony, tellurium, polonium and astate - have both metallic and non-metallic properties.
So, the correct answer is A. on the left side.
