With the discovery of
astatine, only one gap remained in the entire periodic table from element number 1 (hydrogen) to element number 94 (plutonium), and that was element number 61.
74 W TUNGSTEN 85 AT
ASTATINE 16 S SULPHUR 8 O OXYGEN 7 N NITROGEN HAROLD JACOBS
Susan Thorpe provided an additional three in 1995 (
AsTaTiNe, CoPPEr, and TiN) [6], and in 2007 Antonio Joaquin Franco Mariscal brought the total to twelve with the addition of BiSmUTh and KrYPtON.
"A dozen elements can be spelled entirely in symbols from the Periodic Chart: ArSeNiC,
AsTaTiNe, BiSmUTh, CARBON, CoPPEr, IRON, KrYPtON, NEON, PHOsPHORuS, SiLiCoN, TiN, and XeNoN."
hydrogen + xenon + barium + tantalum + boron + praseodymium + iridium + hassium + plutonium + thallium + germanium + scandium + thulium + einsteinium + erbium + cadmium + beryllium + tin + actinium + seaborgium + carbon + fluorine + indium + osmium + nitrogen + potassium + lead + protactinium + silicon + lutetium + rhenium + mercury + argon + neodymium + platinum + thorium lanthanum + oxygen + terbium + radon + samarium + dysprosium + iodine + bohrium + aluminium + chromium + palladium + tungsten + lithium + caesium + dubnium + meitnerium + niobium + ytterbium + gallium + arsenic + iron + sodium + nobelium + francium +
astatine + strontium + copper + gadolinium + yttrium + selenium + curium + chlorine + promethium + gold + uranium + antimony
