What is Barium? b) electron dot symbol ( i realize you cant show this but how many dots around the element) - 8 around the ion. It reacts in water and forms hydroxide. Barium is a chemical element with the symbol Ba and atomic number 56. Barium is a dense alkaline earth metal that occurs naturally in ore deposits and makes up 0.05% of the Earth’s crust (Genter 2001). Just the facts. c) If Y is in period 3, what is the element? Discovery and History. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal.Because of its high chemical reactivity, barium is never found in nature as a free element.Its hydroxide, known in pre-modern times as baryta, does not occur as a mineral, but can be prepared by heating barium carbonate. Atomic Number of Barium. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Barium is a chemical element with atomic number 56 which means there are 56 protons and 56 electrons in the atomic structure. Because of its high chemical reactivity, barium is never found in nature as a free element. Properties, sources and uses of the element barium. Group 2 elements are sufficiently reactive that the free metals are never found naturally; they are, however, much less reactive that Group 1 metals. The number of electrons in each of Barium's shells is 2, 8, 18, 18, 8, 2 and its electron configuration is [Xe] 6s 2. - 5a. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Barium is a member of the alkaline-earth metals.The barium atom has a radius of 222.pm and its Van der Waals radius is 268.pm. Barium is a Block S, Group 2, Period 6 element. Another way to read periodic table and locate an element is by using group number (column) and period number (row). Therefore you can directly look for atomic number 56 to find Barium on periodic table. - P (phosphorous) d) What is the formula of the compound formed from the barium … The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Barium carbonate (BaCO 3) Barium chloride (BaCl 2) Barium fluoride (BaF 2) Barium nitrate [Ba(NO 3) 2] Barium oxide (BaO) Barium sulfate (BaSO 4) Barium sulfide (BaS) Interesting facts: All barium compounds that will dissolve in water or acid are poisonous; It oxidizes in air. Radium, which follows, is radioactive. It is Group 2’s final stable element. Represented by the symbol ‘Ba’, Barium is a group 2 element in the periodic table with atomic number 56. Because of its high chemical reactivity, barium is never found in nature as a free element. Barium Properties. 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