Rubidium is more explosive than the alkali metals above it on the table, but it’s much more interesting when it’s standing almost perfectly still.
Like argon, today’s noble gas coincidentally features prominently in science fiction — albeit in name only. But krypton also takes a place in the science factual story of international weights and measures.
This week, we try to interact with helium, even though it really doesn’t want to. Plus, we explore the occult side of chemistry, as described by the theosophists.