Elements 2 I picked up five elements in periodic table.Answer the elements with some hints. 勉強 - 外国語 Elements 元素 化学 英英 英語 記号 Q1It is one of the period 4 elements.The oxidation number of the metal is three and six. The six one is dangerous for the environment. 選択肢ManganeseChromiumLithiumMolybdenum Q2Flame reaction of this element is yellowgreen. Sulfate salt of this element is used as contrast radiography and is difficult solubility. 選択肢ChlorideCalciumCesiumBarium Q3This element is used to check starch. Chiba prefecture, Japan is one of the biggest source of this element in the world. 選択肢IodineAntimonyManganeseCerium Q4It is the lightest metal in the pediodic table. It is used as ion battery materials. 選択肢PotassiumBeryliumLithiumAlminium Q5It belongs to the platinum group. It is used as catalyst of organic synthesis. In 2010, Japanese chemist received Nobel Prize in Chemistry because of the study of cross-coupling reactions of this element. 選択肢IndiumPalladiumCadmiumNeodymium