The element palladium has 10 valence electrons in its outermost shell, the 4d shell. Many elements follow the octet rule, where they are considered having a full outer shell when there are eight electrons. Transition metals and heavier elements are exceptions and are more stable when they have more electrons in their outer shell.
Palladium is named for the asteroid Pallas, which was named for the Greek goddess of wisdom. The element was discovered in 1803 by William Hyde Wollaston. It is most often found among deposits of other metals such as platinum, nickel and gold. It is a solid element at room temperature, with an atomic weight of 106 and atomic number of 46.