The wrong statement on the basis of the periodic table is option C, which states that there are four transition series in the periodic table, each containing 10 elements.

Explanation:
The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. It is divided into several periods (rows) and groups (columns). Each period represents the energy level or shell occupied by the outermost electrons, while each group represents elements with similar properties due to their similar valence electron configurations.

The transition elements or transition metals are a group of elements that occupy a central block in the periodic table, specifically in groups 3 to 12. They are characterized by the presence of partially filled d orbitals in their electron configurations. The transition metals have similar chemical properties, including the ability to form complex ions, exhibit variable oxidation states, and act as good catalysts.

The correct properties and characteristics related to the periodic table are:

a) The most electronegative element in the periodic table is fluorine:
Fluorine, with an atomic number of 9, is located in group 17 (group VIIA) of the periodic table. It is the most electronegative element because it has the highest tendency to attract electrons towards itself when bonded to other elements. This high electronegativity is due to its small atomic size and high effective nuclear charge.

b) Scandium is the first transition element and belongs to the fourth period:
Scandium, with an atomic number of 21, is the first element in the d-block or transition metals. It belongs to the fourth period (row) of the periodic table as it has four electron shells. Scandium has the electron configuration [Ar] 3d1 4s2.

d) Along a period, halogens have the maximum negative electron gain enthalpy:
Halogens, which include elements like fluorine, chlorine, bromine, iodine, and astatine, belong to group 17 (group VIIA) of the periodic table. They have high electron affinity or electron gain enthalpy, which refers to the energy change when an atom gains an electron to form a negative ion. Halogens have the greatest negative electron gain enthalpy along a period due to their high effective nuclear charge and small atomic size.

c) There are four transition series in the periodic table, each containing 10 elements:
This statement is incorrect. There are actually five transition series in the periodic table, not four. These series are based on the filling of the 3d, 4d, 5d, 6d, and 7d orbitals. Each series contains 10 elements. The first transition series includes the elements from scandium (Sc) to zinc (Zn), the second series includes the elements from yttrium (Y) to cadmium (Cd), the third series includes the elements from lanthanum (La) to mercury (Hg), the fourth series includes the elements from actinium (Ac) to copernicium (Cn), and the fifth series includes the elements from rutherfordium (Rf) onwards.

Therefore, option C is the wrong statement because there are actually five transition series in the periodic table, each containing 10 elements.

There are three transition series,each containing 10 elements.The fourth has incomplete position hence discussed with f-Block elements.