1. Regarding: Transition metals of the Periodic Table 2. Here's my question: the D-Block transition metals will always lose e- (& never gain e-'s) to fully fill (or half-fill) their d-subshells, right? 3. Given what I learned about stable, fully-filled and half-filled subshells, the teacher said the that main group elements in the P-block can form cations or anions. I'm not sure where to go from here. If anyone could help me, that would be great.