Answer:
(a) Here, the
elements are arranged in the order of increasing atomic masses, so according to
Newlands' law of octaves there isa repetition of every eighth element as compared
to the given element. The two sets of elements which have similar properties are
F and Cl are
first and eighth element in the above sequence, therefore, they have similar properties.
Although Na and K have similar properties but they are not related as first and
eighth element in the above sequence.
(b) The
given sequence is according to Newlands' law of octaves represented as
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