What does homogeneous mixture of elements mean

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

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?