classification of matter, earlier attempt of classification,trend in their properties
pragati j binod
it's very nice for all those student who want to gain more knowledge about chemestry..n i am very thankfull to this programme for provide us such a good knowledge it is very usefull for me!thank u very much>>>>
1822 days 1 hours 11 minutes ago
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Oh, well. It is better for all those who are able to understand. I am happy that I have found it and i finally am thankful to such this program.
1912 days 15 hours 52 minutes ago
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