Why is it called quantum theory?

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2. #wrote
3. #modern
4. #theoretical
5. #equation
6. #subatomic
7. #units
8. #planck
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15. #level
16. #individual
17. #mathematical
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19. #atomic
20. #figure
21. #behavior
22. #quanta
23. #basis
24. #physics
25. #nature
26. #involving
27. #which