An atom in the ground state contains three electrons in its outermost principal energy level. This is an atom of an element found in Group A) 1 B) 5 C) 13 D) 3

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Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)