robot spacecraft returned samples from the planetesimal 98765 Aleks, located in

Question

robot spacecraft returned samples from the planetesimal 98765 Aleks, located in the outer Solar System. Mass-spectroscopikc a following data on the isotopes of molybdenum in these samples: i isotope (amu) abundance analysis produced the 100 Mo | 99.91| 45.96 98 , "Mo | 97.91 | 55.96 Use these measurements to complete the entry for molybdenum 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 necessaily the same numbers as the entry for molybdenum in the Periodic Table we use here on Earth. 2 Mo

Explanation / Answer

atomic number of Mo is 42
SO, this will be number at top

At bottom number will be average mass
Lets calculate it
Given:
m1 = 99.91 amu
A1 = 45.0 %
m2 = 97.91 amu
A2 = 55.0 %

use:
atomic mass = sum of (mass of isotope * abundance) / 100
m = (m1*A1 + m2*A2)/100
= (99.91*45.0 + 97.91*55.0)/100
= 98.81 amu
Answer:
42
Mo
98.81

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