According to the octet rule, what is true about the reactivity of halogens? a halogen atom has seven electrons in its valence shell, so halogens are very reactive. a halogen atom has two electrons in its valence shell, so halogens are very unreactive. a halogen atom has two electrons in its valence shell, so halogens are very reactive. a halogen atom has seven electrons in its valence shell, so halogens are very unreactive.

Phosgene (carbonyl chloride), cocl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures: co(g) cl2(g)⇌cocl2(g) carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 477 ∘c . at equilibrium, the concentrations were measured and the following results obtained: gas partial pressure (atm) co 0.830 cl2 1.30 cocl2 0.220 what is the equilibrium constant, kp, of this reaction