By whom was the modern periodic table given?

Correct option is A

The Correct answer is (a) Mosley.

• While Dmitri Mendeleev created the first periodic table in 1869, arranging elements by atomic mass, it was Henry Moseley who gave the modern form of the periodic table in 1913. He demonstrated that atomic number, not atomic mass, was the fundamental property determining the arrangement of elements.

• Moseley's work with X-ray spectra of elements led to the Modern Periodic Law, which states that "the physical and chemical properties of the elements are periodic functions of their atomic numbers."

• This shift from atomic mass to atomic number corrected many of the inconsistencies in Mendeleev's table and is the basis of the periodic table used today. Thus, Moseley's contribution led to the modern version of the periodic table.

Information Booster:
· Mosley: Contributed to the modern periodic table by establishing that elements should be arranged by atomic number.
· Einstein: Famous for his work in physics, particularly the theory of relativity.
· Bohr: Known for his model of the atom and contributions to quantum theory, but not for the periodic table.