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Across 1. Subject which the First Law of Thermodynamics talks about. 5. Stable,but not SO stable. 8. This kind of organic compounds contain a carbonyl group. 10. No individuals remaining. 12. The process in which an atom or a molecule gains or loses electrons. 13. Name of a large number. 18. Organism who have a cell nucleus in their cells. 19. Plays an important role in photosynthesis 23. The longest circle of latitude. 26. “Father of modern chemistry” 28. A kind of astronomical objects of extremely high luminosity. 29. A common alkyl substituent group. 30. Radiation emission. 31. Both the start and the end of this geological period are marked by mass extinctions. 33. P(A)=1 34. A group of post-transitional elements. 37. Variety of life. 39. Elementary particle with no rest mass. 40. The inverse operation to exponentiation. 42. To change into other particles. 46. Method in mathematical and scientific study 47. A luminous "new"star.Actually a dying massive star. 49. d/2 50. A radioactive element which is useful in dating the age of the Earth. 51. A hypothesized medium for the propagation of light. 53. You are now emitting such kind of radiation. 54. The constellation that covers the South Celestial Pole. 56. A statement that seems to be self-contradictory. 57. Measured by the number of hydrogen atoms that an atom can combine with. 58. A chemical reaction that changes the oxidation state of atoms.

Down 2. A cold period of time within an ice age. 3. The nearest Cepheid variable to us. 4. Conserved physical quantity related to motion of an object. 6. The existence of different forms of a chemical element. 7. Balance(in a system). 9. The SI unit for angle measurement. 10. "Disorder" 11. 6.626×10^-34 J·s 14. A type of photoluminescence. 15. Macromolecular biological catalysts. 16. A SI derived unit named after a physicist who shared a Nobel Prize with a famous female scientist. 17. The process that occurs when a particle collides with its antiparticle. 20. “Exact correspondence on either side of a dividing line, plane, center or axis” 21. Without transfer of heat or matter between a thermodynamic system and its surroundings. 22. Larger than any natural number. 24. Occurs when a light source moves away from an observer. 25. The process occurs from the surface of a liquid. 27. A highly-toxic insecticide mentioned in the book <Silent spring>. 32. “The opposite” over "the hypotenuse" 34. The scientific study of our universe. 35. A community of interacting living organisms and the nonliving surrounding components. 36. The scientist who popularized the idea of uniformitarianism 38. A red giant.Prototype of a kind of variable star. 41. Marine animals.Became extinct by the end ofthe Cretaceous period. 43. Metallic element.Toxic when hexavalent. 44. A kind of naturally occuring silicate minerals.Can be harmful to health. 45. Physical quantity with the symbol "I". 48. The oldest minerals on Earth. 52. Formation of mountains. 55. 2,3,5,7…