Atoms with low electronegativity, like calcium, tend to lose electrons and form positive ions (cations). They will most likely bond with atoms that have high electronegativity and readily gain electrons to form negative ions (anions).

Here's why:

* Electronegativity is the measure of an atom's ability to attract electrons in a chemical bond.

* Calcium has a low electronegativity, meaning it doesn't hold onto its electrons very tightly.

* Atoms with high electronegativity like oxygen, chlorine, or fluorine, strongly attract electrons.

Therefore, calcium will readily bond with atoms that have high electronegativity to form ionic compounds.

Examples:

* Calcium oxide (CaO): Calcium loses two electrons to form Ca²⁺, while oxygen gains two electrons to form O²⁻.

* Calcium chloride (CaCl₂): Calcium loses two electrons to form Ca²⁺, while chlorine gains one electron each to form Cl⁻.

In these ionic compounds, the electrostatic attraction between the positively charged calcium ion and the negatively charged nonmetal ion forms the bond.