Answers

2014-02-28T08:01:06+05:30
Dobereiner ;-) he tried to arrange the elements with similar properties into groups. ;-)
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2014-03-01T12:41:00+05:30
The first attempt to classify the elements was made by :(d) Dobereiner he made traids of elements but his method of arranging elements was discarded as he was able to arrange only few elements
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