<span>Radioactive isotopes have been used commercially in all these applications.
The last option (D) is your answer
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Explanation:
Boiling point is the temperature at which vapor pressure of a liquid becomes equal to the atmospheric pressure.
More strong interactions present in the atoms of a compound more heat is required to break it. Hence, greater will be its boiling point.
As the boiling point of oxygen is 90 K so, at a temperature greater than it will change the state of oxygen from liquid to gas.
Similarly, the boiling point of nitrogen is 77 K so, at a temperature 95 K the state of liquid will also change from liquid to gas.
if you are looking for the correct way to answer it the answer is 12 found it while taking a test but got it wrong the first time teacher helped
<span>The electronic configuration of cobalt is :1s2 2s2 2p6 3s2 3p6 3d7 4s2 </span>
The answer Is D
Hope I helped! ( Smiles )
