Elements with two valence electrons that achieve a stable electron configuration by losing electrons are alkaline earth metals.

Here's why:

* Valence Electrons: Alkaline earth metals have two electrons in their outermost shell (valence shell).

* Stable Configuration: They gain a stable electron configuration by losing these two valence electrons. This leaves them with a full outer shell, mimicking the stable configuration of the noble gas preceding them in the periodic table.

* Ions: After losing electrons, alkaline earth metals become positively charged ions (cations) with a +2 charge.

Examples of alkaline earth metals:

* Beryllium (Be)

* Magnesium (Mg)

* Calcium (Ca)

* Strontium (Sr)

* Barium (Ba)

* Radium (Ra)