Category: (post transition metal)
Density at 25°C: solid: n/a
Also known as element 115, this is a very short lived synthetic element with a maximum half life of around 200ms(milliseconds). This is a particularly challenging element to produce. This is because it is hard to get more neutrons into it to make it more stable.
update: Now officially known as Moscovium (Mc) after Moscow, Russia.