What Molecule contains only 3 atoms?

Is Jupiter a inner planet is Saturn a inner planet is uranes a inner planet is neptuen an inner planet? When do volcanic eruptions occur? When more valence electrons of metal are shared it's melting point tends to be? How do circular folds increase the surface area for digestion and absorption in the intestine? Is a susceptibility to rust physical properties? Why was the microscope important to the cell theory? What are different forms of the word several? What is three elememts in period 3 that are lustrous and good conductors of eletricity? How much does a cubic foot of charcoal weigh? What known exosolar planet confirmed within the inhabital has had the highest calculated probability of supporting life? What would happen if the eye ceases to function properly? What does latitude do? What is the formula and name of the only polyatomic ion that has a positive oxidation number? What is the scientific name for low blood pressure? How many kilos are 6.3125 pounds? Are Temperate rainforests always located near the equator? What metric unit would you use to measure the length of a toothpick? What noble gases is red? What is an acceptable time period for the activation and relocation phase of the continuity cycle? What is the climax in false gems?