Answer:
Solids
Explanation:
Electromagnetic waves travel fastest in empty space. But they are slowest in solids
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<h2><em>Solid. Because molecules densely packed it has a high resistance to flow thereby lower kinetic energy.
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The answer is the first one, Xe
The metal is sodium, Na.
<u>Explanation:</u>
K₂O is an ionic compound in which K is in the oxidation state of +1 and it belongs to group 1.
Group 1 elements also form oxides with the metals with the general formula M₂O and M being Na, K, Li and so on.
Metals Like sodium and Potassium are so brittle in nature and also their oxides.
So the other metal that form metal oxide which is brittle as well as ionic in nature, and so the metal oxide is Na₂O.
So the metal is sodium, Na.
