How many free electrisity in one cubid centermeter Cu and silver?

Answer 1

In copper, there are about 13,600 coulombs of "charge" per cc (see ref. 1), meaning the number of free electrons is about 13,000 * 6.241506*10^18. Per ref. 2, the number of free electrons per unit volume = number of free electrons per atom * Avogadro's number * density / atomic mass, and copper is said to have 1 free electron per atom.
Now let's put numbers to Ref. 2's formula to check ref. 1's 13,600 coulombs/cc.
Avogadro = 6.0221415E+23
ElectronsPerCoulomb = 6.241506E+18
CuAtMass = 63.546
CuDensity = 8.92
ElectronsPerCC = Avogadro * CuDensity / CuAtMass =
8.453E+22
CoulombsPerCC = ElectronsPerCC / ElectronsPerCoulomb = 13544
Pretty close! You can figure the corresponding numbers, including charge content in coulomb/cc, for silver knowing Its atomic mass = 107.868, density = 10.49 g/cc, and the fact that like copper, the noble metals, which include silver, are said to have 1 free electron per atom.
But as the discussion in ref. 1 suggests, for various reasons the average number of free electrons per atom may be less than the theoretical value of 1, so these charge content numbers should be thought of as an upper limit.

Answer 2

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