व्हाट हैपन व्हेन एसिड रिएक्ट्स विद मेटल राइट रिएक्शन आल्सोव्हाट हैपन व्हेन एसिड रिएक्ट्स विद मेटल राइट द रिएक्शन ऑफ दो
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why do we need to classify elements we know by now that the elements are the basic units of all types of matter in 1800 only 31 elements were known by 1865 the number of identify elements had more than double 263 at present 114 elements are known of them they recently discovered elements are main made efforts to sciences new elements are continuing with such a large number of elements it is very difficult to study individually the chemistry of all these elements and their in imperial compounds individually to waste out this problem scientist searched for a systematic way to organise their knowledge by class find the elements not only that take to personalize known chemical facts about NTSE patavan predict new ones for undertaking for their study