What is the bonding behavior of the alkaline earth metals?

Expert Answers
ncchemist eNotes educator| Certified Educator

The alkaline earth metals are another name for the group 2 metals in the periodic table.  They consist of beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).  Although helium does sit in group 2 electronically, it is not considered an alkaline earth metal.  The one thing all these metals have in common is that they have 2 electrons in their outermost s orbital that are easily lost to form 2+ cations (or ions with a double positive charge).  As a result, they tend to form ionic bonds with anions, or negatively charged ions.  With a single charged anion like chloride (Cl-), two anions would ionically bond to a single cation (CaCl2, for example).  With doubly charged anions (liike oxygen), one anion would pair with one cation (CaO, for example).