What is special about the noble gasses valence electrons ?

Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3no2(g)+h2o(l)→2hno3(l)+no(g) part a suppose that 4.2 mol no2 and 0.50 mol h2o combine and react completely. which reactant is in excess? express your answer as a chemical formula. nothing

Iwill give extra points to who gets this right

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize