posted by Jenny .
-Why do most atoms form chemical bonds?
-What is the purpose of control in an experiment?
Most atoms form chemical bonds because they can attain a more stable electron configuration, with lower overall energy stored in that configuration.
The purpose of control is to have something to compare the results to.
A. Atoms with incomplete valence shells (outer electron shells) lose, gain, or share electrons in a way that would give them a complete valence shell. That lowers potential energy and increases stability of atoms forming ionic or covalent bonds.
B. The control in an experiment provides a standard of comparison for the the part of the experiment in which some factor is changed from its normal value or state (the control).