Here we have to chose the correct statement which affect the discovery of the atomic number on the periodic table.
The discovery of the atomic number of the elements: C. It allowed the elements to be placed in strict order of increasing atomic number.
The use of X-ray determined the atomic number or number of electrons present in an element. The number of electrons is the basis of generate the periodic table, where the elements are arranged in terms of the number of electrons present in the atom in early stage of periodic table.
However in later the modern periodic table generated, which has group and period in terms of their property. Although the strictness on the increasing number of electrons are followed.
Henry Moseley discovery contribute to the development of the periodic table as it allowed the elements to be placed in strict order of increasing atomic number.
Atomic number of any element will tell about the number of electrons or number of protons present in that element.
Henry Moseley used X - rays and x-rays are generated by the emission of an electron from an atom, when these x-rays fall on an atom then they discover the atomic number of an atom on the basis of number of electrons. So, in the periodic table all the elements are arranged in the increasing order of the atomic number as electrons define the properties of the atom.
Hence, option (C) is correct.
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