Question

Look at 3 or 4 other atoms using simulation. Do any of them have a whole number for atomic mass

Answer 1

Answer:

Here is your answer.....

Answer 2

The silicon atomic mass as $28.0891g$.

Explanation:

• Multiply the amu by the percentage of occurrence to arrive at an average atomic mass of.

$28.0891$  

• We take the amu of each isotope multiply it by the percentage of occurrence, and end up with a weighted average:

$27.9769*0.9218+28.9765*0.0471+29.9738*0.312$

• quick note - there is a bit of rounding in here - the abundance percentages add up to 1.01, so the number we calculate is going to be slightly off.

This simplifies to:

$25.7891+1.3648+0.9352=28.0891g$

Checking  the internet  to verify our answer, I found 28.0855 u ± 0.0003.