Which of the following statement is false?

The long form periodic table is nothing but just a graphical representation of Pauli’s principle.

The  correct answer is option 3. The long form periodic table is nothing but just a graphical representation of Pauli’s principle.

To determine which statement is false, let us analyze each one in detail:

1. In modern periodic table the elements are arranged in increasing order of atomic number.

The modern periodic table is indeed arranged in increasing order of atomic number (the number of protons in an atom's nucleus). This arrangement reflects the modern periodic law, which states that the properties of elements are a periodic function of their atomic numbers. This statement is true.

2. The number of periods in the long form periodic table is 7.

The long form of the periodic table, also known as the extended or modern periodic table, has 7 periods. Each period corresponds to the number of electron shells that the elements in that row have. This statement is true.

3. The long form periodic table is nothing but just a graphical representation of Pauli’s principle.

Pauli's Exclusion Principle states that no two electrons in an atom can have the same set of four quantum numbers. While this principle is fundamental to the arrangement of electrons in atoms, the periodic table is not merely a graphical representation of this principle. The periodic table organizes elements based on atomic number and recurring chemical properties. It incorporates various principles, including electron configurations, periodic trends, and atomic structure. This statement is false because the periodic table is much more than just a representation of Pauli’s Exclusion Principle.

4. Elements of III period are called typical elements.

The elements in the third period (sodium to argon) are often referred to as typical elements because they represent a range of properties found in other periods. This statement is true.

The false statement is 3. The long form periodic table is nothing but just a graphical representation of Pauli’s principle. This statement is incorrect because the long form periodic table represents much more than just Pauli’s Exclusion Principle. It organizes elements based on atomic numbers, electron configurations, and periodic trends, reflecting a comprehensive understanding of chemical behavior and atomic structure.