Because of the tilt of the axis, causing some places to be a little farther than others, even if they are right next to each other, or halfway across the globe!
Answer:
Group 8A
Explanation:
This is because the elements in Group 8A is stable, what I mean is this elements have the maximum number of electrons in there last orbit so they dont need to form any compund with any other element in the periodic table.
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(0.878)(267.8) + (0.122)(269.9)=
268 u (three sig fig)
Check my calculations