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- Element X has 2 isotopes. One of the isotopes has a mass of 18.9 with an abundance of 75.4%. The second isotope with a mass of 20.2 and an abundance of 24.6%. Calculate the average Atomic Mass of element X. Give your answer to the nearest tenth (one decimal).A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of tin in these samples: isotope 118 "Sn 120 Sn Use these measurements to complete the entry for tin in the Periodic Table that would be used on 98765 ALEKS. Be sure your answers have the correct number of significant digits. Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for tin in the Periodic Table we use here on Earth. 0 Sn mass relative (amu) abundance 117.9 54.% 0 119.9 Continue 46.% X S evee muuraw Hill LLC. All Rights Reserved. Submit Assignment Terms of Use | Privacy Center Accessibility6. If Nitrogen-14 absorbs an alpha particle and then emits a Hydrogen-1, what is the resulting nucleus? 7. If Au-185 emits an alpha particle, what is the nucleus formed? 8. What nucleus emits an alpha particle and forms Th-234?
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