Find the right elements in the periodic table using the clues below. Hover over the table to magnify.

Combine the elements' symbols in the order listed below to find the 9 letter password. _ _ _ _ _ _ _ _ _

1. I am a solid, reactive-nonmetal. I weigh about twice the atomic weight of oxygen and I sit above a famous poisonous metalloid.
2. I sit really close to Superman's worst enemy. I am gassy but noble. I sit below a very luminous element.
3. Fourth column, look for 2-8-10-2.
4. Look for a famous tech valley in California. The element you are looking for is a gas in that row that is often used in swimming pools.
5. I am named after a famous scientist. I am a solid, radioactive actinide next to a metal with an unknown state.