This noble gas is argon (Ar), because its third energy level is full.
The answer you are looking for is "bromine". Hope this helps!
<span>Astatine-217 is the daughter element produced by the alpha decay of Francium-221.</span>
They are three types of mixtures:
-solutions : they are homogeneous mixtures of 2 or more sub. in a single phase.
-suspensions: if the particles in a solvent are so large that they settle out unless constantly tired, the mixture is called a suspension.
-colloids: particles that are intermediate in size between those of solutions and suspensions form mixtures called colloids.
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