A robot spacecraft returned samples from the planetesimal 98765 Aleks, located i

Question

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: 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. 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.

Explanation / Answer

average atomic mass of Sn

          = ( mass abundance of 118 isotope x 118 atomic mass /100) + ( mass abundance of 115 isotope x 115 atomic mass / 100)

          = ( 55 x 117.9 /100) + ( 45 x 114.9 / 100)

            = 116.55 amu

Sn element has atomic number 50

Hence symbol is    116.5550 Sn

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