Question

Modern periodic law was proposed by-

• A. Mendeleev
• B. Henry Moseley
• C. Werner
• D. Bohr and Bury

Answer 1

The correct option is B

Henry Moseley

Explanation:

• Modern periodic law states that the chemical and physical properties of elements are the periodic function of their atomic numbers.
• It was proposed by Henry Moseley in the year 1913 from his X-ray studies.
• The modern periodic table has 18 groups (vertical columns) 7 periods (horizontal rows).

Therefore, the correct option is (B) Henry Moseley