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.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

c, liquids evaporate, creating a gas