Question: what is um in the periodic table?
Answer: The Latin names of metals often ended with -um, e.g. aurum, argentum, ferrum and also the names of sodium, potassium, and magnesium, derived from soda, potassa or potash, and magnesia, were given by Humphry Davy* in 1807, with the derivative form -ium; and although some of the later metals have received names in -um, ...