Answer :
Final answer:
Based on the property of conductivity, elements can be sorted into metals (good conductors), nonmetals (poor conductors), and metalloids (moderate conductors). The order from greatest to least conductivity is metals-metalloids-nonmetals.
Explanation:
The elements can be divided into main classes - metals, nonmetals, and metalloids, based on their properties such as conductivity. Metals are good conductors of electricity and heat due to having a high number of free charges.
On the other hand, nonmetals, including dull and brittle elements, are poor conductors of heat and electricity. Metalloids, including elements like boron and silicon, have properties that fall somewhere between metals and nonmetals. They are also known as semiconductors due to their moderate conductivity. Therefore, in terms of conductivity from greatest to least, the correct order is (d) metals-metalloids-nonmetals.
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