Chemistry
(i) State any one reason for discarding 'Law of Octaves'.
(ii) What is periodicity? Explain the cause of periodicity.
Periodic Table
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Answer
(i) The Newland's law of Octaves did not work with heavier elements i.e., those lying beyond Calcium. As more and more elements were discovered, they could not be fitted into Newland's Octaves. Hence, this law was discarded.
(ii) The phenomenon of occurrence of characteristic properties of elements at definite intervals in the modern periodic table when elements are arranged in increasing order of their atomic numbers is called periodicity.
Reasons for Periodicity is — after definite intervals of atomic number, similar valence shell electronic configuration occurs and as properties of elements depend upon the arrangement of electrons in various shells including valence shells, hence periodicity in properties occur.
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