Whats one example of density in your everyday life in your own thoughts

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.

How do you interpret a chromagram for what mixtures contain?

The two isotopes of chlorine are 3517cl and 3717cl. which isotope is the most abundant?