340/ periodic table

I noticed that the 340 starts with "HER", and the periodic table of chemical elements, starting with hydrogen (symbol H) and followed Helium (symbol He), thought it curious, as I always say, it could be something or nothing can be but share because who knows there do not have a key and other person sees things i  not seen.
Marcelo Leandro
http://www.ptable.com/?lang=pt   Try in Dave webtoy : http://zodiackillerciphers.com/webtoy/