Question

2.2) By observing the correlation in the first pair, complete the second pair
Dobereiner: Triad :: Newlands law:
Mendeleev's periodic table: Atomic Mass:: Modern periodic table:
Group -1: Alkali metals::
Halogens
. Chlorine:2,8,7:: Fluorine:
Horizontal row: Periods::
Groups​

Answer 1

Answer:

Explanation:

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