Atoms of which elements can donate electrons, turning into positive charged ions: a) C b) Li c) Ba d) P

In this case, you need to understand what positive charged ions are. The fact is that in chemical compounds there is an ionic and covalent bond. And it is for the ionic bond that we can talk about positive charged ions. In other cases, there is simply a slight displacement of the electronic charge. And there a common pair of electrons is formed. And in our case, we have two metals Li and Ba. And this is the answer to this question. This goes under points in and g. A R and C (phosphorus and carbon), it is non-metals and does not form positive ions.