Find the number of moles and the number of representative particles for each problem. 18) 5.00 g of H2

19) 187 g of Al

20) 0.000264 g of Li2HPO4

21) 333 g SnF2

Here is the link to the all information u need i mean answer key

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.