How many grams of oxygen gas must be in an 8.50 L container to exert a pressure of 0.900 atm at a temperature of 20.00°C?

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

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.

Who examines and coordinates the cleanup of polluted sites?