What does the formula 2n2 represent?

Which statement correctly describes potassium iodide, ki? there is a one-to-one ratio of potassium ions to iodide ions. potassium gains electrons and iodine loses electrons during the reaction. the lattice is held together by potassium anions and iodide cations.

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

The excretory system,need answers for all: )