
Respuesta :
Answer: Gas
Explanation: Because to check temperature of a room you use a gas in then room
Be-4 Solid Â
Â
Mg-12 Solid Â
Â
Ca-20 Solid Â
Â
Sr-38 Solid Â
Â
Ba-56 Solid Â
Â
Ra-88 Solid Â
Â
All alkaline metals are solid, but have low melting points.