There are three domains, and six kingdoms.
The answer to this question is Betz Cells
These would be the elements in row 2 the alkaline metals. Elements in a row usually share many qualities such as electon reactivity as well as similar characteristics like the fact that many alkaline metals are considered Cations, ions with positive charges. Some examples are beryllium and calcium.
Density. Density is the measurement of how much matter is in a substance
