5. Molecules and Compounds

In the ionic compound aluminum oxide, which species is the cation?

In the ionic compound $Fe{C}_{l}3$ (iron(III) chloride), which ions and how many of each are present in one formula unit?

Which ion would combine with $B^a$ to form a neutral ionic compound with the formula unit $BaCl{2}_{}$?

Lithium forms ${\mathrm{Li}}^{+}$ ions and oxygen forms $O^2$ ions. Can a stable ionic compound be made from lithium and oxygen, and if so, what is its correct formula unit?

When zinc reacts with sulfur to form an ionic compound, what is the correct formula unit of the product?

Write the correct ionic formula for the compound formed between each of the following pairs of ions:b. Ca²⁺ and S²⁻

In the ionic formula $M_{g}3X2$, magnesium forms $M^g$. Which element could X be so that the compound is electrically neutral?

Consider the following Lewis symbols for elements X and Y: (6.1, 6.2, 6.5)

e. What would be the formula of a compound of X and sulfur?

Write the correct ionic formula for the compound formed between each of the following pairs of ions:e. Al³⁺ and S²⁻

The elements in red in the periodic table can form cations having more than one charge. Write the formulas and names of the compounds that are formed between the red cations and the blue anions depicted in the periodic table.