Noble gases (group 18 atoms) do not form ionic bonds with the metals though they are no metals. Why?

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

Answer; carbon monoxide (co);

08.01 hope this and can i get brainlist? ?