which action would result in the more (financially) valuable product: taking one proton from each nucleus in a sample of gold or adding one proton to each gold nucleus?

Taking a proton (p) away

79 AU - 1p = atomic number 78??

Adding a Proton

Au79 + 1p = ??80

Which is more valuable?????

Platinum and mercury. Is platinum more valuable?

Yes correct

thank you

No worries