What type of substance cannot be separated physically

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration?

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Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.