Who discovered atomic numbers and by which study?

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Henry Moseley- X- ray spectra

John dalton - radiation

J.J Thomson – Cathode ray

None of the above

answer is A.

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Detailed Solution

Concept- The quantity of protons in the nucleus is known as an atomic number. For instance, an atom with an atomic number of eight has an oxygen atom in its nucleus, which has 8 protons.
The atomic numbers are listed in increasing order on the periodic table. Because neutral atoms have an equal amount of protons and electrons, the atomic number of an element can be calculated by counting the number of electrons that surround each of its atoms' nuclei.
Henry Moseley made the discovery of the atomic number in 1913 while analysing X-ray spectra. He discovered that when we increase the atomic number by one, certain lines in the x-ray spectra of atoms move by the same amount each time.
Hence, the correct answer is option 1).

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