Answer:
Superiority of the Long form of
the Table over
Mendeleev?s Table:
(i) This table is based on a more
fundamental property, i. e atomic number.
(ii) It correlates the position
of the elements with its electronic configuration more clearly.
(iii) The completion of each
period is more logical. In a period as the atomic number increases, the energy
shells are gradually filled up until an inert gas configuration is reached. It
eliminates the even and odd series of IV, V, VI and VII periods of Mendeleev's
periodic table.
(iv) The position of VIIIth
group is appropriate in this table.
All the transition elements have
been brought in the middle as the properties of transition elements are intermediate
between s- and p-block elements.
(v) Due to separation of two
subgroups, dissimilar elements do not fall together. One vertical column
accommodates elements with same electronic configuration thereby showing same
properties.
(vi) In this table a complete
separation between metals and non-metals has been achieved. The non-metals are present
in the upper right comer of the periodic table.
(vii) There is a gradual change
in properties of the elements with increase in their atomic numbers, i.e., periodicity
of properties can be easily visualised. The same properties of recurrence in
properties occur after the intervals of 2, 8, 8, 18, 18 and 32 elements which indicates
the capacity of various periods of the table.
(viii) This arrangement of
elements is easy to remember and reproduce.
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