Here's a breakdown of their key characteristics:

Properties:

* Highly reactive: They readily react with water, oxygen, and other elements.

* Shiny and silvery-white: In their pure form.

* Good conductors of heat and electricity: Due to their metallic nature.

* Relatively soft: Compared to other metals, they are easily cut.

* Form alkaline solutions: When reacted with water, they produce basic (alkaline) solutions.

Elements in Group 2:

* Beryllium (Be)

* Magnesium (Mg)

* Calcium (Ca)

* Strontium (Sr)

* Barium (Ba)

* Radium (Ra) (Radioactive)

Applications:

* Magnesium: Used in alloys, construction materials, and fire retardants.

* Calcium: Found in bones, teeth, and cement.

* Strontium: Used in fireworks and some types of glass.

* Barium: Used in medical imaging and in the manufacture of batteries.

* Radium: Used in research and historically in luminous paint.

Fun Facts:

* The alkaline earth metals are named for their oxides, which were originally found in the earth's crust and produce alkaline solutions when mixed with water.

* The reactivity of the alkaline earth metals increases as you go down the group.

* Radium is a radioactive element and is not found naturally in large quantities.

Let me know if you would like to learn more about any specific element in Group 2!