Answer:
Lead, Pb.
Explanation:
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In this case, since the molar mass of the compound is 293.8 g/mol, and the molecular formula is NaXO₄, we infer that the molar mass is computed via:
[tex]293.8=m_{Na}+m_X+4*m_O[/tex]
Thus, we can solve for the atomic mass of X as shown below:
[tex]293.8=23.0+m_X+4*16.0\\\\m_X=293.8-23.0-4*16.0\\\\m_X=206.8g/mol[/tex]
Thus, the element whose atomic mass is about 206.8 g/mol is lead (207.2 g/mol) even when it is not properly a transition metal.
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