Element X is a grey solid.
It combines with chlorine to form a polar molecule with the formula XCl . In this compound, element X has an oxidation state of +1.
In potassium iodide solution, it dissolves to form a coloured solution.
At 500 °C, it becomes a coloured vapour.
What is the identity of element X?
A. manganese
B. fluorine
C. iodine
D. carbon
E. lithium