Question

A certain electron transition in a hydrogen atom has $\Delta$ E= -1.64x10^-18 J. What would the $\Delta$ E value be for the same transition in He $^{+}$ ?

Answer 1

$\Delta$ E= -1.64x10^-18 J x Z^2

        Z = atomic number

          atomic number of He = 2

$\Delta$ E= -1.64x10^-18 J x 2^2

         = -6.56 x 10^-18 J

$\Delta$ E = - 6.56 x 10^-18 J