Question

Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass

Answer 1

Moseley show that atomic mass is the fundamental property to the atomic number

Answer 2

Answer: Henery Moseley

Explanation:

He showed the importance of atomic mass which are more important than atomic number of an element.

He was an English physicist. He justifies the prior chemical and empirical notion of atomic number based on physical laws.  

Atomic number is important because most of the defects in Mendeleev's classification are rectified when the elements which are arranged in the periodic table have atomic number in increasing order.