Identify the cation and anion in the molecular formula of potassium sulphate?

Write the formula of potassium sulphate.

What is cation and anion.

Sodium and potassium are placed in the same group of modern periodic table. If the molecular formula of sodium sulphate is Na, So, then decide the molecular formula of potassium sulphate. Give reason for your answer.

The molecular formula of aluminium sulphate is ......... .

What are cations and anions ?

Identify the cations and anions present in aluminium oxide :