The long form of the periodic table is constructed on the basis of repeating electronic …………….. of the atoms when they are arranged in the order of increasing atomic numbers.

Define modern periodic law. How is the long form of the periodic table constructed on the basis of this law?

Explain how the elements are arranged in the form of the periodic table.

The region in long form periodic table where most of the non metals are present

Which of the following statements about the modern periodic table are incorrect ? (a) The elements in Modern periodic table are arranged on the basis of their decreasing atomic number. (b) The elements in Modern periodic table are arranged on the basis of their increasing atomic masses. (c) Isotopes are placed in adjoining groups in the periodic table. (d) The elements in the modern periodic table are arranged on the basis of their increasing atomic number.

Assertion (A) : It is a better way of arranging the elements in the periodic table is according to the increasing atomic number. Reason (R) : This arrangement. according to increasing atomic number eliminated the problem of anomalous series.

Elements A, B and C belong to the same period in the long form of the periodic table. The nature of the oxides of A, B and C is amphoteric basic and acidic respectively. The correct order of the atomic numbers of these elements is

Discuss the position of hydrogen in the periodic table on the basis of its electronic configuration.

In the periodic table, inversion of atomic weights took place in this pair