Which Group has 8 valence electrons and are very stable?

What happens to isotopes that are unstable?

Iam hoping to create 5.72 grams of glucose. the plant was given 4.75 liters of co2 and 2.81 g of h20. which reactant was the limiting reagent? how much excess mass did we have of the other reactant?

What does an electron configuration for an atom relate to the atoms placement on the periodic table