How will the compounds, `MgCl_2` and CaO be formed from their elements?

How are the compounds formed?

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method. Fe (Valency 2) and S (Valency 2)

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method. Ca (Valency 2) and O (Valency 2)

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method. H (Valency 1) and O (Valency 2)

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method. C (Valency 4) and ) O (Valency 2)

Atoms of element B form hcp lattice and those of the element A occupy 2/3^(rd) of tetrahedral voids. What is the formula of the compoound formed by the elements A and B?

In the following table, seven elements P,Q,R,S,T,U and V (here letters are not the usual symbol of the elements)of the modern periodic table with their atomic numbers are given If Q combines with U, what would be the formula of the compound formed? If Q and U are replaced by their respective metals what will be the formula of the compound formed.

Ionic hydrides are formed by the elements of __________.

Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements. Element 71 and fluorine.

Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements. Magnesium and nitrogen