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The number of nucleons in a nucleus is the number of. The emission and absorption spectra of different elements provides evidence for the existence of. The nucleus of an atom contains protons.he number of nucleons in a nucleus is the number of. The emission and absorption spectra of different elements provides evidence for the existence of. The nucleus of an atom contains protons.
The newly formed element vanished quickly in a flash of radiation that scientists could measure. That flash, or fingerprint, confirmed the existence of an element with 115 protons at its center. That would give it the atomic number of 115 on the periodic table, the list of all elements known to humanity.he newly formed element vanished quickly in a flash of radiation that scientists could measure. That flash, or fingerprint, confirmed the existence of an element with 115 protons at its center. That would give it the atomic number of 115 on the periodic table, the list of all elements known to humanity.