Write the group number for calcium. Express your answer as a whole

Calcium belongs to group 2 of the periodic table, often referred to as the alkaline earth metals. This group is known for its shiny appearance and reactivity, although calcium is less reactive than some of its groupmates like barium and radium. In terms of its role in biology, calcium is essential for various physiological processes, including muscle contraction and nerve transmission. It's also crucial for building and maintaining strong bones and teeth, making it a superstar element in both chemistry and health!