Question

The periodic table of today owes its development to two chemists namely:
A. Rutherford and Moseley
B. Alexander Newlands and Dobereiner
C. Dmitri Mendeleev and Lothar Meyer
D. De Broglie and Neil Bohr

Answer 1

The arrangement of elements in a tabular form or vertical and horizontal column according to their property is known as a periodic table. Many scientists tried to plan the periodic table by using valorous properties of elements such as chemical property, atomic weight, atomic number, etc. as all the elements are not known from the initial so, scientists faced a lot of problems. So, many periodic tables came from time to time. Nowadays, the acceptable periodic table is known as a modern periodic table.

Complete answer:
Rutherford and Moseley gave atomic theory, not periodic table, so option (A) is incorrect.
Alexander Newlands arranged the elements in order of atomic weight but Dobereiner did not related with the periodic table preparation. He only gave the trends of periodic property so, option (B) is not correct.
Mendeleev, the full name was Dmitri Lvanovich Mendeleev was Russian chemist. He classified the element in his periodic table according to the fundamental property atomic weight
Lothar Mayer, the full name was Julius Lothar Mayer's full name was German chemistry. He found that arrangement according to the atomic weight does not exactly arrange the elements having the same chemical properties in the same column. He gave the priority to the valence state rather than atomic weight. So, option (C) is correct.
De Broglie told about the angular moment of orbitals and Neil Bohr gave the atomic model, so option (D) is not correct.

Therefore, option (B) is correct.

Note: In Modern periodic table elements are arranged on the basis of electronic configuration. Modern periodic table consists of rows and columns. Rows known as period and columns are known as groups. Modern periodic table consists of eighteen periods and seven columns. In the Modern periodic table hydrogen is placed in group-eighteen and period-one due to fully-filled electronic configuration.