Which of the following statements is true? choose one: a. bronze was used as early as 4000 b. c.e. to replace less-desirable iron tools. b. bronze is harder than copper, so it retains a cutting edge sharper than that of copper. c. bronze is an alloy of copper and chromium. d. copper is not easily smelted, because extremely high temperature is required.

B.Bronze is harder than copper, so it retains a cutting edge sharper than that of copper.

Explanation:

The importance of bronze in the history of the human kind can not be only measured in the durability but the help that it provided to our ancestors, the things they were allowed to do once they dicovered how to mold it, and the tools that they produced and made many every day tasks easier for them and the ability of bronze to mantain the cutting edge longer than copper was one of the main reasons why it took its places in the fabrication of many tools.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a