Fill in the blanks given below:
$(i)$ The first scientist to think about the properties of elements was ......... .
$(ii)$ The relationship of properties of elements suggested by Dobereiner is known as ........... .
$(iii)$ The Law of Octaves was proposed by the chemist ......... .
$(iv)$ The first periodic table was constructed by .......... and .......... .

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(N/A) $(i)$ Johann Wolfgang $D$öbereiner
$(ii)$ Law of Triads
$(iii)$ John Alexander Newlands
$(iv)$ Dmitri Mendeleev and Lothar Meyer

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