Elements in group 2 are all called alkaline earth metals. What is most similar about the alkaline earth metals?

A) how many protons and neutrons they have
B) which chemical properties they have
C) how many total electrons they have
D) which period they are most often found in

All alkaline Earth metals have similar properties because they all have two valence electrons. They readily give up their two valence electrons to achieve a full outer energy level, which is the most stable arrangement of electrons.

Explanation:

Elements in group 2 are called alkaline earth metals, the most similarity about the alkaline metals is which chemical properties they have.

Further Explanation

Periodic table  

   Periodic table is a table that contains elements arranged in columns called groups and rows called periods.

   Elements are arranged based on physical and chemical properties such that elements in the same group will have similar physical and chemical properties.  

Chemical families  

   Based on the chemical properties elements belong to a family of elements sharing similar chemical or physical characteristics.

   Examples of common chemical families include; alkali metals, alkaline-earth metals, halogens and noble gases among others.

Alkaline-earth metals  

   These are elements that are found in group 2 of the periodic table. Alkaline-earth metals include, Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.  

Properties  of Alkaline-earth metals

   Alkaline earth metals have a valence of two since they form ions by losing two electrons from their outermost energy levels.

   Unlike the Alkali metals, the earth metals have a smaller atom size and are not as reactive compared to alkali metals.

   Alkaline-earth metals are highly metallic and are good conductors of electricity.  

   They react with water and steam to form metal hydroxide and metal oxides respectively  

   They react with air to form metal oxides  

   Reactivity of alkaline metals depends on the ease of losing electrons, thus the reactivity increases down the group as the number of energy levels increases.

   Additionally, alkaline-earth metals have low electronegativities and low electron affinities  

B. What Chemical Properties they have

Explanation:

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