Element with a museum in Las Vegas (4)
I believe the answer is:
neon
(Other definitions for neon that I've seen before include "Atomic number 10" , "Colourless noble gas" , "None (anag.)" , "Type of lamp" , "Gas used in fluorescent lamps" .)
I believe the answer is:
neon
(Other definitions for neon that I've seen before include "Atomic number 10" , "Colourless noble gas" , "None (anag.)" , "Type of lamp" , "Gas used in fluorescent lamps" .)