Balancing chemical equations.

1.
cas + h2o > ca(hs)^2 + ca(oh)^2

2. au^2s^3 + h2 > au + h2s

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.