Question

Decide whether each pair of elements in the table below will form an ionic compound. If they will write the empirical formula and name of the compound formed in the spaces provided.

Answer 1

Element 1	Element 2	forms ionic compound	Empirical formula	name of ionic compound
Oxygen (non metal)	Calcium(metal)	yes	CaO	Calcium oxide
Rubidium (metal)	iodine(nonmetal)	yes	RbI2	Rubidium iodide
Calcium (metal)	bromine(nonmetal)	yes	CaBr2	Calcium bromide
Oxygen (nonmetal)	cesium (metal)	yes	Cs2O	Cesium oxide

Ionic compound are formed between a metal and non metal.

Rules for writting a formula ,

Charge of cation ( metal) is writren

Charge of anion ( nonmetal) is written .

Then balancing the charge .

For example.

Charge of Ca = +2

Charge of O = -2.

Then equal the total positive charge and negative charge.

Hence, formula is CaO.

In writiing name , cation is name first then the anion.

For the anion part ide is written after root name.

For example name of ionic compound CaO is

Calcium oxide.