Who gave the Modern Periodic Table in 1913? 

Bohr

The correct answer is option 2. Mosley.

Henry Moseley's work in 1913 revolutionized the understanding of the periodic table. Prior to Moseley's contributions, Dmitri Mendeleev's periodic table was arranged primarily based on atomic mass. However, there were some inconsistencies in the table, and it was not entirely clear why certain elements were grouped together.

Moseley conducted experiments in which he bombarded different elements with X-rays and observed the characteristic X-ray spectra produced. He discovered that each element had a unique pattern of X-ray emissions, and he realized that these patterns were directly related to the element's atomic number, rather than its atomic mass.

Moseley's key insight was that the number of protons in an atom's nucleus, which corresponds to its atomic number, determines its chemical properties. Therefore, he proposed rearranging the periodic table based on increasing atomic number rather than atomic mass. This reordering eliminated many of the inconsistencies in the previous table and provided a more accurate reflection of the underlying structure of the elements.

By arranging the elements according to their atomic number, Moseley's periodic table provided a clearer understanding of the periodic trends in properties such as atomic size, electronegativity, and chemical reactivity. This work laid the foundation for the modern periodic table that we use today.