Energy of an electron in hydrogen

[mahrap]

What is the energy of an electron in the 2s orbital of a hydrogen atom?
I thought En = -RZ^2 / n^2

Why am i not getting the right answer with

Z = 1
n = 2
and R just the value of the constant

 

[AGNuke]

E = -13.6 \frac{z^2}{n^2}eV

 

[Redbelly98]

What is the energy of an electron in the 2s orbital of a hydrogen atom?



I thought En = -RZ^2 / n^2

Why am i not getting the right answer with

Z = 1
n = 2
and R just the value of the constant

If you don't tell us what answer you got, it is difficult to say why it is wrong.