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Characteristics of group 2 in the periodic table

Updated February 21, 2017

Group 2 elements are those that appear in the second column of the periodic table. The group 2 elements are beryllium, magnesium, calcium, strontium, barium and radium. Group 2 elements share a number of characteristics in common.

Types

All group 2 elements in their pure state have two valence electrons (i.e., two electrons in their outermost shell) if they have not been ionised. These electrons are in an s-type orbital. As a general rule of thumb, the ionisation energy (the amount of energy it takes to ionise the atom) is typically greater than for group 1 elements but less than for transition metals or nonmetals.

Features

Although they are less reactive as a general rule than group 1 elements, group 2 elements are highly reactive and hence are never found in isolation in nature. Because they are easily ionised, they often form ionic compounds with nonmetals such as chlorine or oxygen, where the group 2 atom will lose two electrons to the nonmetallic atoms; the positively charged group 2 ion is now attracted to the negatively charged nonmetal ions and thus forms an ionic compound.

Function

In pure form, the group 2 elements display metallic properties, meaning that they are good conductors of heat and electricity. When they form compounds, however, they often become insulators. Calcium carbonate (limestone) and calcium phosphate (bones and teeth), for example, are not good conductors of electricity.

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About the Author

Based in San Diego, John Brennan has been writing about science and the environment since 2006. His articles have appeared in "Plenty," "San Diego Reader," "Santa Barbara Independent" and "East Bay Monthly." Brennan holds a Bachelor of Science in biology from the University of California, San Diego.