What property of metals makes them good conductors of electricity?

Explanation:

For a substance to be able to conduct electricity it is necessary to have free electrons.

Since, metals are the substances that have more number of electrons as compared to non-metals. Hence, metals are good conductors of electricity.

For example, copper, nickel, aluminium are all good conductors of heat and electricity.

Thus, we can conclude that mobile or free electrons is the property of metals which makes them good conductors of electricity.

your answer is c) plasma

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.