The outer shell is the valence electrons and they are very loosely bound to the nucleus - less force by the nucleus on the valence electrons, so valence shell's electrons are exchanged first in any reaction.
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in the third shell, an electron has more energy and is further from the nucleus
It represents the family the element is in.
electrons
valence electrons
4/3 * pi * (125 - 27)Improved answer with the same result:If the outer circumference is 10 times pi cm then its outer radius is 5 cm and its inner radius is 3 cm.outer volume - inner volume = volume of the sphere's shell(4/3*pi*53) - (4/3*pi*33) = 410.5014401 or 410.5 cubic cm to 1 decimal place