Question

Calcium has a charge of +2. The chart lists the charges of different ions.

Answer 1

Answer: $CaO$, $CaF_2$, or $CaCl_2$

Explanation:- For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here calcium metal is having an oxidation state of +2, thus the anions must  bear a negative charge to form neutral ionic compound.

Thus the possibilities are:

$Ca^{2+}+O^{2-}\rightarrow CaO$

$Ca^{2+}+P^{3-}\rightarrow Ca_3P_2$

$Ca^{2+}+Cl^{-}\rightarrow CaCl_2$

$Ca^{2+}+F^{-}\rightarrow CaF_2$

Answer 2

The possible resulting chemical formulas for an ionic compound with calcium given the respective charges of the ions are: CaO, CaMg, or CaF₂ and CaO, CaF₂, or CaCl₂. This is because when dealing with these compounds, you simply need to interchange the oxidation state of the two elements and place as the subscript of the element. For instance, when we have Ca²⁺ and F⁻, the result is CaF₂. However, when the oxidation states of the two compounds are equal, the subscript is 1. That is, for Ca²⁺ and Mg²⁻, the result is CaMg. And for Ca²⁺ and Cl⁻, the result is CaCl₂.