The number of stones in 0.250 mole sulfur

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

How many lone pairs of electrons are on the central atom of no3- and what is the molecular shape? one, trigonal planar zero, trigonal pyramidal zero, trigonal planar one, tetrahedral one, trigonal pyramidal

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold