Sodium becomes a positive ion and chlorine becomes a negative ion. The positive and negative ions attract each other and form the ionic compound sodium chloride. A sodium and chlorine atom are near ...

Certain cells, commonly called excitable cells, are unique because of their ability to generate electrical signals. Although several types of excitable cells exist — including neurons, muscle ...

Spectroscopic studies in recent years have shown that these vacuum sparks are efficient sources of multiply charged ions. Several forms of sparks were tried; the trembleur à vide the hot-sparks ...