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Fourth most abundant chemical [[element]] in the Universe, with [[atomic number]] Z=6.

...Definition|nucleus]] of a suitable [[isotope]] of an element with a high [[atomic number]] splits into two nuclei of lower atomic numbers and one or more [[neutron]

...ical elements|chemical element]], having the [[chemical symbol]] Sm. Its [[atomic number]] (the number of [[proton]]s) is 62. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Rn. Its [[atomic number]] (the number of [[proton]]s) is 86. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Eu. Its [[atomic number]] (the number of [[proton]]s) is 63. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Sr. Its [[atomic number]] (the number of [[proton]]s) is 38. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Zr. Its [[atomic number]] (the number of [[proton]]s) is 42. It has a [[Atomic mass#Standard atomic

A silvery-white metallic transition metal, with symbol Sc and atomic number 21.

...ical elements|chemical element]], having the [[chemical symbol]] Mn. Its [[atomic number]] (the number of [[proton]]s) is 25. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Dy. Its [[atomic number]] (the number of [[proton]]s) is 66. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Sn. Its [[atomic number]] (the number of [[proton]]s) is 51. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Te. Its [[atomic number]] (the number of [[proton]]s) is 52. It has a [[Atomic mass#Standard atomic

...nd as a [[gas]] in its elemental form. It has the [[chemical symbol]] F, [[atomic number]] (number of [[protons]]) ''Z'' = 9, and a [[Atomic mass#Standard

...ical elements|chemical element]], having the [[chemical symbol]] Ho. Its [[atomic number]] (the number of [[proton]]s) is 67. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Lu. Its [[atomic number]] (the number of [[proton]]s) is 71. It has a [[Atomic mass#Standard atomic

...mical elements|chemical element]], having the [[chemical symbol]] Y. Its [[atomic number]] (the number of [[proton]]s) is 41. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Pr. Its [[atomic number]] (the number of [[proton]]s) is 59. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] In. Its [[atomic number]] (the number of [[proton]]s) is 49. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Yb. Its [[atomic number]] (the number of [[proton]]s) is 70. It has a [[Atomic mass#Standard atomic

...ical elements|chemical element]], having the [[chemical symbol]] Ru. Its [[atomic number]] (the number of [[proton]]s) is 44. It has a [[Atomic mass#Standard atomic