" Sodium oxide "(Na_(2)O)" is produced when: "

What is the coordination number of (i) sodium in sodium oxide (Na_2O) ? (ii) oxide ion in sodium oxide (Na_2O) ? (iii) calcium in calcium fluoride (CaF_2) ? (iv) zinc in zinc blende (ZnS)?

Calculate the formula masses of following compounds : (i) Sodium oxide, Na_(2)O (ii) Aluminium oxide, Al_(2)O_(3) (Given : Atomic masses : Na = 23 u , O = 16 u , Al = 27 u )

Sodium oxide Na_(2)O is a crystalline solid. It has :

The average oxidation state of sulphur in sodium tetrathonate (Na_(2)S_(4)O_(6)) is :

What is the oxidation state of (i) lithium in Li_2O (ii) Sodium in Na_2O_2 . (iii) potassium in KO_2 .