Describe the cause of atomic emission spectrum of an element

Part of molten rock at mid-ocean ridges

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.

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa