Answer:
Explanation:
Given
No of atoms of hydrogen 
Temperature of room 
Thermal energy of the atoms is given by

where k=boltzmann constant


Hence the energy of the atoms is 
The answer is
2.5 N
B
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Answer:
Kr
Explanation:
the element that is in group 18 is noble gasses. the elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
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