LIFE SCIENCE

Detailed explanation-1: -The correct answer is Atomic number. The modern periodic law invented by Dmitri Mendeleev and Albert Ghiorso. He states that the properties of elements are a periodic function of their atomic numbers. Hence, the modern periodic table is based on the atomic numbers of elements.

Detailed explanation-2: -In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

Detailed explanation-3: -Atomic number was adopted as the basis of modern periodic table and the modern periodic law can be stated as follows: ‘Properties of elements are a periodic function of their atomic number. ‘

Detailed explanation-4: -Modern periodic table is based on the atomic numbers of elements as according to the modern periodic law the properties of elements are a periodic function of their atomic numbers.