Science help!!?

if you know any of the following questions please answer...








4.) In the next room you find yourselves surrounded by bright yellow crystals. As you remove the gas masks, the old chemist, tinted yellow by light reflecting off the crystals, appears yet again. "The atoms of this element have 6 valence electrons." Carve the symbol of the correct element in the room's door.





6.) The sixth room you are transported to, on the second floor of the building, is made of a silver-gray metallic solid. Taking a knife out of your backpack, you are able to cut a piece of it off with the blade because the substance is 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. What element is this?

Science help!!?
4) oxygen O


6)dunno
Reply:I disagree, Sulfer would be a better answer for numer 4 because it has 6 vallence electrons and it is naturally yellow in colour.





6. unknown, need more information