Nonexistent.
Seaborgium is highly radioactive, with its most stable isotope having a half-life of about two minutes. I doubt that enough has ever been produced at one time to make its physical state relevant, but it would presumably be a solid, if you could manage to collect enough of it together to matter without the heat produced from its own radioactive decay vaporizing it.
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Seaborgium is a synthetic element that is not found in nature, so its properties at room temperature are not well defined. However, as a transactinide element, it is expected to be a solid at room temperature.
the physical state of oxygen at room temperature is GAS! - Joslyn ;*
At normal room temperature, oxygen is a gas.
Magnesium "MG" is a solid at room temperature.
Bromine is a liquid at room temperature.
At room temperature berkelium is a solid metal.