Q. The first attempt to classify elements was made by ?
Solution:
The earliest attempt to classify the elements was in 1789, when Antoine Lavoisier grouped the elements based on their properties into gases, non-metals, metals and earths.
Modern periodic law had been given by- Moseley
Which one is known as father of periodic table-Mendeleev
In modern period table the number of period is-7
In modern periodic table the group number is- 18
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