Which group of elements is known for having two valence electrons and forming +2 ions?

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The group of elements known for having two valence electrons and commonly forming +2 ions is the alkaline earth metals. These elements are located in group 2 of the periodic table and include beryllium, magnesium, calcium, strontium, barium, and radium.

Having two valence electrons means that these elements have a tendency to lose both of these electrons in chemical reactions to achieve a more stable electron configuration, typically resembling the nearest noble gas. When they lose these two electrons, they become positively charged ions with a +2 charge, denoted as M²⁺, where M represents the alkaline earth metal.

This characteristic is crucial for understanding their chemical behavior, such as their reactivity with nonmetals. For example, when calcium reacts with oxygen, it loses two electrons to form a Ca²⁺ ion, which then pairs with oxide ions (O²⁻) to form calcium oxide (CaO).

In contrast, the alkali metals found in group 1 have only one valence electron and typically form +1 ions. Halogens belong to group 17 and are characterized by having seven valence electrons, usually forming -1 ions. Noble gases are found in group 18 and are generally un

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