The outer shell electrons are only involved in the bonding process since they are the only 'incomplete' shell and it needs to be fulfilled by another element.
The answer you are looking for is A. the average atomic mass hope this helped have a nice day :)
A mile.
For reference, it's about 1,607 or so meters, and 1km is 1,000.
A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. Physical changes can further be classified as reversible or irreversible. The melted ice cube may be refrozen, so melting is a reversible physical change.
