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Dear Student
The answer to question number 1 is:
Chemistry is a branch of science which involves with the study of composition, structure , properties and reactions of various compounds and elements , more specifically matter on an atomic or molecular level to get a understanding about them,.

The answer to question number 2 is:
Periodic law was formulated based on observations by different scientists. Some of them were John Newland, Johann Dobereiner.
Particularly Lothar Meyer and Dimitri mendeleev  made trends in element properties apparent.
Currently the periodic table followed is given by law proposed by Henry Moseley.

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