REVISION NOTES for modern periodic table
Answers
Answered by
0
»
Periodic Classification of Elements
Revision Notes on Periodic Classification of Elements
Placing similar groups and species together is known as Classification. Classification is needed to easily understand the properties of different elements in a periodic table. Elements with similar properties are placed in one group to understand them easily.
Dobereiner’s triad consider three elements, in which atomic mass of central element is the arithmetic mean to two other elements. For Example, Atomic masses of lithium, sodium and potassium are 7, 23 and 39. The arithmetic mean of 7 and 39 gives 23. But disadvantage is the presence of only few triads.
Similar questions