Question

What are the structural features of the Modern Periodic Table? Why is this Periodic Table supposed to be superior to other Periodic Tables?

Accepted Answer

The structural features of the modern periodic table are-

1. Periods — The horizontal rows in the table are known as periods which are $7$ in number.
2. Groups — The vertical columns in the periodic table are known as groups which are $18$ in number.

Modern periodic table is superior to other periodic tables because:

(i) Long form of the periodic table is based upon atomic number which is a more fundamental property of the atom.
(ii) It relates to the position of an element in the periodic table with its electronic configuration.

(iii) It removes the anomaly about the position of isotopes in the Mendeleev’s Table.
(iv) The position of Vlll group is also justified 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) Most of the defects that were present in Mendeleev's Periodic Table are eliminated in long form of Periodic Table. e.g.,

1. The elements having different properties are placed in the different group.

2. Presence of three elements in VIII group is no longer a problem because it has been divided into three groups (group 8, 9 and 10).

P. Bahadur Solutions for Chapter: Periodic Classification of Elements, Exercise 2: Exercise 3

P. Bahadur Chemistry Solutions for Exercise - P. Bahadur Solutions for Chapter: Periodic Classification of Elements, Exercise 2: Exercise 3

Questions from P. Bahadur Solutions for Chapter: Periodic Classification of Elements, Exercise 2: Exercise 3 with Hints & Solutions

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