Misc: Which gas was named after the Greek word for 'sun'?

Questions

In 1810 Frederic---------- , pianist, composer, born. ?

In 1864 Patent issued for taking and projecting ---------- to Louis Ducos du Hauron (he never did build such a machine, though). ?

In 1910 David---------- , actor, born. ?

In 1927 Harry---------- , entertainer, born. ?

In 1946 Lana ---------- (in Santa Monica, CA), actress, born. ?