copper
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Copper was discovered first. It has been used by humans for thousands of years, while arsenic's discovery as a chemical element came later in the 13th century.
Copper was discovered first, since it occurs naturally in its pure form and has been used by humans since ancient times. Arsenic, on the other hand, was discovered later and is a metalloid that is typically found in combination with other elements in minerals.
Arsenic was called "Devil's copper" by German miners due to its toxicity and resemblance to copper in color. However, arsenic is a hazardous element that can cause health issues if not handled properly.
Copper has been used since ancient times and was one of the first metals to be discovered and utilized by humans. Its discovery predates recorded history, but archaeological evidence suggests that copper was in use as far back as the 5th millennium BC.
Copper(II) chloride was first discovered by the French chemist Antoine-Francois Fourcroy in 1798.
No, arsenic is not a good conductor of heat or electricity. It is classified as a metalloid and has poor electrical and thermal conductivity compared to metals like copper or aluminum.