Que 1. What was Döbereiner's basis of classifying elements? Ans. According to Döber...

Que 1. The three elements A, B and C with similar properties have atomic masses X, Y and Z respectiv...

Que 1. Write the main aim of classifying elements. Name the basic property of elements used in the d...

Que 1. (a) How do you calculate the valency of an element from its electronic configuration? ...