Using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. Explain your answers.

Gas

Explanation: Because to check temperature of a room you use a gas in then room

Be-4 Solid  

Mg-12 Solid  

Ca-20 Solid  

Sr-38 Solid  

Ba-56 Solid  

Ra-88 Solid  

All alkaline metals are solid, but have low melting points.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

did anyone actually do this? like if anyone has submitted this i rly need .