defence exam BSF Head Constable (RO/RM) Mock Test 2023 General Science Chemistry

In 1817, which law of periodicity showed that the atomic weight of phosphorus is the mean of those of nitrogen and arsenic?

1
Moseley's Periodic Law
2
Mendeleev's Periodic Law
3
Dobereiner’s Law of Triads
4
Newlands' Octaves Law
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