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    • Oxygen

      2018 11 5ensp;0183;ensp;Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. By mass, oxygen is the third most abundant element in the universe, after hydrogen and

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      2015 1 4ensp;0183;ensp;MSC, ==gt; Main Ship Equipments Equipment Types Main Marine Manufacturers Ship Spare Parts, =1=A=B=C=D=

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    • History of chemistry

      2018 11 5ensp;0183;ensp;The extraction of iron from its ore into a workable metal is much more difficult than copper or tin. While iron is not better suited for tools than bronze (until steel was discovered), iron ore is much more abundant and common than either copper or tin. So iron was much more often available locally without have to trade for it.

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    • Nuclear Materials The Nuclear Weapon Archive

      2018 5 19ensp;0183;ensp;6.4 Other Materials. Some other materials of special interest for nuclear weapons use are listed below. 6.4.1 Beryllium (Be) Beryllium, element 4, is named after the mineral beryl, which is a natural ore (beryllium aluminum silicate, Be3Al2(SiO3)6, aquamarine and

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