The symbols of some of the ions are given below :
`K^(+) , Al^(3+) , Br^(-) , O^(2-)`
Using this information, write down the formulae of :
(i) Aluminium bromide
(ii) Potassium oxide

(a) What is an ion ? How is an ion formed ? Explain with the help of two examples of different ions. (b) The valencies (or charges) of some of the ions of are given below : Using this information, write down the formulae of the following compunds : (i) Sodium phosphate , (ii) Ammonium sulphate (iii) Calcium hydroxide , (iv) Lead bromide

(a) What is the difference between a cation and an anion? Explain with examples. (b) The valencies (or charges) of some of he ions are given below : Using this information, write down the formula of : (i) Sodium sulphide (ii) Copper nitrate

Write down the symbol and formula of the given element: Potassium

Write down the formulae of (i) sodium oxide (ii) aluminium chloride (iii) sodium sulphide (iv) magnesium hydroxide

Write down the formulae of (i) sodium oxide (ii) aluminium chloride (iii) sodium sulphide (iv) magnesium hydroxide

The valency of aluminium in aluminium oxide (Al_2O_3) is

An element B forms an oxide B, O_(3) . Find its valency and write the formula of its bromide.