The sixth room you are transported to is on the second floor of the castle and it is composed of a silver-gray metallic solid . Taking a knife out of your backpack, you are able to cut a piece of it off because the substance if very soft. A portion of the element touches your hand, burning your skin. Filling a small glass beaker with water from your canteen, you drop the substance in to observe its reaction with water. It momentarily floats on the water before causing a small explosion. This element has 5 neutrons and an oxidation number of +2. What element is this? * Room 6