Consider an atom confined to a linear cavity of length 2.0 nm inside a molecular sieve material. From a quantum-chemical point of view, this system can be representative
of a particle in a one-dimensional box. Determine the spacing, ΔE, between energy
levels E1 and E2 (in J) for the case where trapped atom is (a) 3He and (b) 129Xe.

What is the mass of 4 molecules of co2

Compare and contrast the bohr model and the electron cloud models of the atom.

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.