(i) Long form of the periodic table is based upon atomic number which is a more fundamental property of the atom.
(ii) It relates 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.
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(iv) It removes the anomaly of inversions in the Mendeleev’s Table. Thus proceeds K in the periodic table because it has a lower atomic number though its atomic mass is more than that of potassium.
(v) It also removes the other anomalies found in Mendeleev’s periodic table (like grouping of chemically dissimilar elements and separation of chemically similar elements etc.).
(vi) It reflects more clearly the changes in the properties of various elements while moving across a period or down a group.
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(vii) Typical (representative) and transition elements have-been separated in this form of the periodic table.
(viii) It also separates metals and non-metals.