Why is Palladium the biggest exception of the periodic table?

The atomic number of palladium is 46, and its electronic configuration is 2,8,18,18. Remarkably, it is the only element in the periodic table having more than eight electrons in the outermost shell. read more

Remarkably, it is the only element in the periodic table having more than eight electrons in the outermost shell. Palladium is the 8th element of the second transition series, coming in between rhodium and silver. Rhodium (atomic no. 45) has the configuration [Kr]5s1 4d8, and for silver(atomic no. 47) it is [Kr]5s1 4d10. read more

Elements and Periodic Table History As early as 1700, miners in Brazil were aware of a metal they called ouro podre, ‘worthless gold,’ which is a native alloy of palladium and gold. However, it was not from this that palladium was first extracted, but from platinum, and this was achieved in 1803 by William Wollaston. read more