As early as the begining of nineteeth century, it was found that certain elements resembled with other elements in certain aspects. For example, flourine, chlorine, bromine and iodine were found to show similarity in many properties.
In this way scientists tried to group elements with similar properties so that the study of all the known elements and their compounds could be made with the help of a few groups only.
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Name the triads that Dobereiner could suggest?
Lithium, sodium and potassium were put in one group or triad on the basis of their similiar properties. What is the name of this group? State their properties.
Consider the following elements: K, I, Li, Sr, CI, Mg, Br, Ca, Na. Separate these elements in three groups or triads having similar properties. State one property in each case on the basis of which groups are separated.
