A(n) WHAT is the combination of two or more types of matter. mixture or solution the subject is science please I need help

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.

Salt in oceans comes from and of rocks

Which compound most likely has the greatest bond energy?