Of its valence electrons or the no. Of valences in its Valence shell .In case of noble gases, their outermost shell is absolutely crammed so no emptiness is available in the outer maximum shell. Thus the oxidation kingdom is 0(zero)for Noble gases. Because, they've complete electrons in their out maximum shell.
Answer: By keeping plastic from being dumped in to the water, especially water in witch animals inhabit. also by using reusable cups instead of plastic bottles.
