Are electrons lost or gained during the formation of a negatively charged ion

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

In 2002, the rare earth elements mine in mountain pass, california was closed because

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o