Which of the following choices must occur during all chemical changes

Answer explain why it is not possible to deduce a complete order of reactivity.

Which suspect most likely committed the robbery and how do you know

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.