What causes the pressure inside oxygen tanks to change as they filled

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

How many moles of oxygen react with 12 moles of aluminum

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.