* Electronic Configuration: Calcium has an electronic configuration of 2, 8, 8, 2. This means it has two electrons in its outermost shell (the valence shell).
* Octet Rule: Atoms tend to gain, lose, or share electrons to achieve a stable configuration of eight electrons in their valence shell (the octet rule).
* Losing Electrons: Calcium is in group 2 of the periodic table, meaning it has a tendency to lose its two valence electrons to become a positively charged ion (Ca²⁺). This leaves it with a full outer shell (like the noble gas Argon).
Therefore, calcium's two valence electrons are responsible for its chemical bonding behavior.
