Packet 9: Bonus 17
The Born–Oppenheimer approximation treats these objects as stationary relative to the motion of electrons. For 10 points each:
[10e] Name these very dense objects found at the center of an atom.
ANSWER: atomic nuclei [or atomic nucleus]
[10h] Maria Goeppert Mayer proposed the shell model of the nucleus, which explains why nuclei are especially stable at these values. Calcium-48 is extremely long lived due to having 20 protons and 28 neutrons, both of which are these values.
ANSWER: magic numbers [accept doubly-magic]
[10m] In this process, a nucleus decays by emitting an electron or positron, changing the atomic number by one. Wolfgang Pauli proposed the neutrino to explain where extra energy is carried during this form of decay.
ANSWER: beta decay [accept beta-plus or beta-minus decay]
<Chemistry — June Yin> | SHOW-ME Four Packet 9
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 24 | 17.08 | 96% | 58% | 17% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Harpeth Hall | Merrol Hyde B | 10 | 0 | 0 | 10 | E |
| USN A | Franklin Road Academy | 10 | 0 | 10 | 20 | EM |
| USN C | Owensboro | 10 | 0 | 10 | 20 | EM |
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| Rube Goldberg XIX | 11/20/2025 | ✓ | 16 | 13.75 | 94% | 44% | 0% |
| SHOW-ME Four Nationwide HS | 11/20/2025 | ✓ | 5 | 28.00 | 100% | 100% | 80% |
| SPOOKY IX | 11/20/2025 | ✓ | 3 | 16.67 | 100% | 67% | 0% |