This is element number 29 on the periodic table. As you can deduce from its atomic number, it has 29 protons and 29 electrons and its most common isotope contains 24 neutrons to give it an average atomic mass of 63.546 amu. It has a Ground state configuration of [Ar]4s13d10 and is one of those elements that does not like to conform to Aufbau's rules of simple orbital filling.

Copper is also a main component in the alloy that makes the penny, but it is also used, sometimes, in piping to help reduce the amounts of lead in drinking water. Unlike other metals, copper is not replaced by hydrochloric acid. In order to dissolve a penny in acid, it must be placed in nitric acid where it then dissolves into copper ions and changes the liquid's color from colorless to blue.