Here's why:
* Alkaline earth metals are located in Group 2 of the periodic table.
* Valence electrons are the electrons in the outermost shell of an atom, which are involved in chemical bonding.
* Ground state electron configuration refers to the arrangement of electrons in an atom when it is in its lowest energy state.
For example:
* Beryllium (Be): 1s² 2s² (valence electrons: 2s²)
* Magnesium (Mg): 1s² 2s² 2p⁶ 3s² (valence electrons: 3s²)
* Calcium (Ca): 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² (valence electrons: 4s²)
The ns² configuration signifies that alkaline earth metals have two valence electrons in their outermost s orbital, which explains their tendency to lose these two electrons to form +2 cations.
