The density of copper is 8.92 g/cm3 . A rectangular block of copper is depicted below. Calculate the mass of the copper block in kilograms.

Ametal with a large number of free flowing electrons most likely has good conductivity

You can look it up online and some images should pop up 

13 protons and 14 neutrons.  this also means that the amount of electrons also is 13 because electrons have the same amount as protons..the atomic number means the amount of protons (which effectively tells you the electrons) the atomic mass, tells you the amount of protons and neutrons in the nucleus.hope this . 

A. pipe, good luck, hope you get it right