The pale-green, gaseous element named ______________ was used as a poisonous gas in World War I.
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Q153: The major credit for the development of
Q154: The numerals that follow the symbols in
Q155: The vertical columns in the periodic table
Q156: The compound BeF2 is named _.
Q157: An atom or chemical combination of atoms
Q159: An element that tends to gain or
Q160: In a given period, the element of
Q161: Give the name for each element.
Q162: The elements that hardly ever react with
Q163: The major division of chemistry that deals
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