問題：Atomic number of this element is 54.<br /><br />It is a rare gas (group 18 in periodic table).<br /><br />It is used in strobe of photograph.<br /> 出題元【Elements】

出題元【Elements】

問題

Atomic number of this element is 54.<br /><br />It is a rare gas (group 18 in periodic table).<br /><br />It is used in strobe of photograph.<br />

Ｑ：Atomic number of this element is 54.<br /><br />It is a rare gas (group 18 in periodic table).<br /><br />It is used in strobe of photograph.<br />

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