The elements that have two valence electrons are located in Group 2 of the periodic table, also known as the alkaline earth metals. These elements include:

* Beryllium (Be)

* Magnesium (Mg)

* Calcium (Ca)

* Strontium (Sr)

* Barium (Ba)

* Radium (Ra)

These elements all have two electrons in their outermost energy level, which makes them highly reactive and likely to lose these two electrons to form +2 ions.