How many grams of Kr are in a 8.55 L cylinder at 12.3 ∘C and 8.33 atm?

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.

The point along a planet's orbit where it is closest to the sun is called the

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!