not sure if this has been mentioned, vetoed, whatnot... i'm new here, and i have some specific stuff in mind, so please bear with me....
i thought of a few new elements that i believe could prove interesting in various situations:
[ALKE] ALKALINE : heavy particles generates heat when in contact with water (unlike rubidium, which plain goes boom) generates pressure as well when in contact with acid* (baking soda volcanoes, anyone?)
*could be replaced with oil, perhaps (?)
[ETLY] ELECTROLYTE : heavy particles generated electrons when in contact with acid (a DIY battery, if you will) - some heat is also generated in the process, particles decay into coal after reaction output/decay ratio is affected by temperature (hotter, makes for less efficient reaction)
[CEMT] CEMENT : liquid turns into BRICK when in contact with salt
[PIEZ] PIEZO : heavy particles generates electrons when under pressure
[CLYS] CATALYST : liquid - possibly gas or light powder (?) clones surrounding particles (three-fold) when heated - disappears afterwards
[IMPL] IMPLOSIVE : heavy particles collapses abruptly upon itself when struck with voltage, rapidly decreasing pressure (momentary black hole)
specific values are left open... as i am pretty sure this would require some experiments to get right
now, i'm well aware i could create my own build and code these myself (i'm C++ trained) - but i fear that i've arrived at a less-than-convenient time to do so, judging by the sticky saying "HALT" atop the page... so here's my suggenstions for the time being