1. Xenon Chemical element, chemical symbol Xe, atomic number 54.

2. Radon: Chemical element, chemical symbol Rn, atomic number 86.

3. The atomic number appears as a subscript.

4. Lead (atomic number 82) and gold (atomic number 79) are defined as elements by the number of protons they possess.

5. Bromine Nonmetallic chemical element, chemical symbol Br, atomic number 35.

6. Hydrogen: Lightest chemical element, chemical symbol H, atomic number 1.

7. Nitrogen: Gaseous chemical element, chemical symbol N, atomic number 7.

8. The electron range increases with decreasing atomic number and increasing incident beam energy E 0.

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9. Isotope of hydrogen, chemical symbol 2H or D, atomic number 1 (But atomic weight approximately 2).

10. Sulfur: Nonmetallic chemical element, chemical symbol S, atomic number 16.

11. That is why this says atomic number, but for most intents and purposes we can say this could be atomic mass.

12. Selenium: Semimetallic chemical element, chemical symbol Se, atomic number 34.

13. Boron: Semimetallic chemical element, chemical symbol B, atomic number 5.

14. No change in atomic number is possible without a radical change in properties.

15. The ionic radius varies among the elements depending on atomic number and ionic charge of the ion.

16. This selection of elements also reveals the increase in atomic weight over atomic number.

17. Carbon has three naturally occurring isotopes, that is, atoms of the same atomic number but different atomic weights.

18. The presence of neutrons explains why the atomic weights of elements do not correspond with their atomic numbers.

19. All atoms of the same element have the same atomic number; for exam-ple, the atomic number of carbon is 6.

20. Cerium :Chemical element, a rare earth metal of the lanthanide series (hence having many properties of the transition elements), chemical symbol Ce, atomic number 58.

21. Nickel Metallic chemical element, one of the transition elements, chemical symbol Ni, atomic number 28.

22. So, even though we don't have the lithium anymore, we still keep that atomic number 7 around.

23. Strontium Chemical element, one of the alkaline earth metals, chemical symbol Sr, atomic number 38.

24. Iron: Metallic chemical element, one of the transition elements, chemical symbol Fe, atomic number 26.

25. But right now I am going to give it to you as Mendeleev enunciated it. Atomic number, we will learn later, is the improvement.

26. Chromium: Metallic chemical element, one of the transition elements, chemical symbol Cr, atomic number 24.

27. Tungsten ( or wolfram ) : Metallic chemical element, of the transition elements, chemical symbol W, atomic number 74.

28. Iridium: Metallic chemical element, one of the transition elements, chemical symbol Ir, atomic number 77.

29. All elements is a substance all of whose atoms have the same atomic number.

30. Beryllium : Chemical element , lightest of the alkaline earth metals, chemical symbol Be, atomic number 4.

31. Silver: Metallic chemical element, one of the transition elements, chemical symbol Ag, atomic number 47.

32. Lead: Metallic chemical element, chemical symbol PB, atomic number 82. Lead is a soft, silvery white or grayish, malleable, ductile, dense metal that conducts electricity poorly.

33. Mercury ( quicksilver ): Metallic chemical element, chemical symbol Hg, atomic number 80.

34. Potassium: Chemical element , one of the alkali metals, chemical symbol K, atomic number 19.

35. The density measurement technology of foam material with low atomic number was established by low energy X-ray radioscopy .

36. Iodine: Nonmetallic chemical element, chemical symbol I, atomic number 53.

37. The bigger the atomic number, the deeper the impurity level is.

38. Atomic number 18, atomic weight 39. 948, is a rare gas. 1894 by the British chemist Rayleigh and Ramsay found.

38. try its best to gather and build good sentences.

39. Lead: Metallic chemical element, chemical symbol PB, atomic number 82.

40. Radium, atomic number 88, atomic weight 2260254, is a natural radioelement , elements were derived from Latin, is intended to "ray."

41. The filter is constructed as a sandwich from three materials of different atomic number.

42. R is a reference referring to effective atomic number directly.

43. Phosphorus Nonmetallic chemical element, chemical symbol P, atomic number 15.

44. Rare earth metal: Any of a large class of chemical elements including scandium (atomic number 21), yttrium (39), and the 15 elements from 57 (lanthanum) to 71.

45. It is on the periodic table of elements under the symbol Bi at atomic number 83.

46. Zirconium: Metallic chemical element, one of the transition elements, chemical symbol Zr, atomic number 40.

47. So, let's say we have an atomic number of 3, 3 that means we have 3 electrons, so we better hope to get our neutral atom that we have a charge of plus 3in the nucleus.