hafnium is 72. There are 15 elements missing ... Lanthanum and the element before it in the periodic table, barium, have an exotic relationship. Barium 139, for example, has a half-life of just 68 ...
Show more In the final programme in our Elements series, Justin Rowlatt looks at the rarest and oddest members of the periodic table. Selenium, bismuth, molybdenum, antimony, rhenium, hafnium ...
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