Answers

2015-01-03T22:13:11+05:30
Periodic table is a collection no elements.
It is useful in science and technology as it gives the information of element's mass and their atomic no.
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I think it z collection of number of elements...
2015-01-03T22:13:29+05:30
Because we can know many forulas and we know to do numericals wecan do it easyily
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