Which of the following scientists discovered that the atomic number of an element is a more fundamental property of an element than its atomic mass?

Newlands, Mendeleev and Dobereiner all tried to correlate the properties of elements with their atomic masses. Newlands, an English scientist, arranged the elements in order of their increasing atomic masses. He started with hydrogen (atomic mass 1 u), the element having the lowest atomic mass and ended with thorium, which was the 56^th element. He found that the properties of the eighth element were similar to the properties of the first element. Dobereiner tried to arrange the elements with similar properties into groups called triads having 3 elements each. According to Dobereiner, when the elements of any particular triad were arranged in order of their increasing atomic masses, the atomic mass of middle element was roughly the mean or average of the atomic masses of the other two elements. Mendeleev, in his periodic table, classified the elements on the basis of their increasing atomic masses and the formula of their oxides and hydrides. Later on, Henry Moseley discovered that atomic number is a more appropriate parameter to determine the properties of an element rather than its atomic mass.