List of top Chemistry Questions on Atoms

The nuclear radius of hydrogen atom will be ______.
The energy equivalent of 1.0 kg of substance is ______.
The radius of the innermost electron orbit of a hydrogen atom is $5.3 \times 10^{-11}$ m. What is the radius of the $n=3$ orbit?
The ground state energy of hydrogen atom is -13.6 eV. What is the ratio of kinetic energy and potential energy of the electron of this state?
........ is a potent vasodilator.
Number of atoms of He in 100 amu of He (atomic wt. of He is 4) are: