weight

Is a silver coin heavier than a copper-nickle coin of the same coin?

you dont have scale???

Ken,
the density of silver is 10,5 (g/cm³), CuNi alloy is approx 8,9
theoretically a silver ccoin should be heavier than an CuNi version with the same specifications

but for example belgium 500Fr 1980 exists in silver plated version and silver version, both same sizes and weight...
everything depends on the alloy used, so I believe the difference can't be made using a scale

Tony

The coin I have in question is Falkland Islands 50 Pence.
https://en.numista.com/catalogue/pieces13561.html
It has no weight listed. Mine weighs 28.0 grams.

The 18A proof coin made of silver weighs 28.2.
So I don't know which coin I have. I bought it in a 8 coin set in a plastic case.

if it was in circulation .2 grams would have been rubbed off.

  if you really want to know follow these instructions
https://en.numista.com/numisdoc/measure-a-coin-s-density-27.html

My scale is accurate to 0.1 grams and I did the density test and it came out 8.52, so it must be nickle-copper.

If you can't tell by the colour (get a coin that you know is silver, and one that you know is cupro-nickel and check them out; the silver one will usually look slightly matter and 'whiter'), the other good test I know is the 'ring' test (usually better for larger coins, and over .800 fine):
Balance the coin on the end of a finger and tap it with something hard, but not so hard as to make a mark (I find a pencil or a Bic is usually good). Silver coins will ring very nicely; Cu-Ni won't.

In the old big houses, tea-bells used to be made out of silver for that reason.

Winston