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| 135 Isotope has the hightst Neutron absorbtion cross section |
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| Halogen found in mineral Cryolite |
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| Most electronegative and reactive of the elements |
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| Group of elements known for self-heating, extremem explosiveness, and short lifetimes |
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| Highest "packing fraction" |
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| Lightest Ferromagnetic element |
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| 90% component of earth core |
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| Noble gas discovered in 1898 |
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| Essential to red blood cell development, in that Vitamin B12 requires it. |
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| Detected in Egyptian statuettes |
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| Detected in glass at the ruins of Pompeii |
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| Name refers to goblins that live in mines |
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| Attached to two hydrogen atoms in its most famous compound, known for its smell of rotten eggs |
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| Natural form consists of 8 atoms held in a "puckered" ring |
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| Only Lanthanide that does not occur in nature |
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| Named after titan who stole fire |
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| 18-year lifespan, used in small batteries |
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| Element's pure form, which is not found in nature, is used to remove trace gases from vacuum tubes. |
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| Combined with Thorium, this element is used in lamps for wavelength calibration. |
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| Noble gas that can form a compound with hydrogen and fluorine |
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| Noble gas with atomic number 18 |
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| Used with oxygen gas when deep diving |
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| Most electro-positive element |
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| Commonly used in atomic clocks |
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| This element's singly-ionized form produces the strongest absorption features in the solar spectrum, the so-calleed H and K lines |
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| Found use in medicine for centuries, including Paul Erlich's "magic bullet" for syphilis. |
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| Toxic metalloid with atomic number 33. |
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| Often used in photography due to the white light it gives off when ionized |
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| Element with greek name meaning "hidden thing" |
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| One of its oxides can catalyze ozone destruction in the stratosphere. |
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| One of its oxides serves as a fuel for the production of tropospheric ozone |
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| Biologically active forms of it are produced naturally by lightening and certain types of bacteria. |
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| Diatomic gas is most abundant in the atmosphere. |
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